diff --git a/src/modules/overseas-warehouse/api/lastMileOrders.test.ts b/src/modules/overseas-warehouse/api/lastMileOrders.test.ts
index 25cf9cd9..f865432f 100644
--- a/src/modules/overseas-warehouse/api/lastMileOrders.test.ts
+++ b/src/modules/overseas-warehouse/api/lastMileOrders.test.ts
@@ -1,6 +1,6 @@
 import { beforeEach, describe, expect, it, vi } from 'vitest'
 import { http } from '@/shared/api/http'
-import { reviewCargoDiscard } from './lastMileOrders'
+import { reviewCargoDiscard, updateLastMileOrderPalletMerge } from './lastMileOrders'
 import { changeContainerReceivingWarehouse, convertLastMileContainerToInboundPlans, createManualInboundPlan, getContainerPlanProgress, getLastMileOrder, getLastMileOrderManualNodes, listContainerPlanProgress, listLastMileOrders, transferLastMileOrders, updateLastMileOrderHold, updateLastMileOrderManualNodes } from './lastMileOrders'
 
 vi.mock('@/shared/api/http', async (importOriginal) => ({ ...(await importOriginal<typeof import('@/shared/api/http')>()), http: { get: vi.fn(), put: vi.fn(), post: vi.fn() } }))
@@ -148,3 +148,12 @@ describe('last-mile order overseas API', () => {
     )
   })
 })
+
+it('sets and cancels a merge group with string IDs and explicit customer scope', async () => {
+  vi.mocked(http.put).mockResolvedValue({ code: '200', message: 'success', data: null })
+  for (const required of [true, false]) {
+    await updateLastMileOrderPalletMerge(['2092873463568596994'], '2092618717861048321', required)
+    expect(http.put).toHaveBeenLastCalledWith('/platform/v1/last-leg/orders/pallet-merge-required/batch',
+      { orderIds: ['2092873463568596994'], palletMergeRequired: required }, { params: { customerId: '2092618717861048321' } })
+  }
+})
diff --git a/src/modules/overseas-warehouse/api/lastMileOrders.ts b/src/modules/overseas-warehouse/api/lastMileOrders.ts
index 23ba0e59..cd9a2afa 100644
--- a/src/modules/overseas-warehouse/api/lastMileOrders.ts
+++ b/src/modules/overseas-warehouse/api/lastMileOrders.ts
@@ -427,6 +427,15 @@ export async function transferLastMileOrders(payload: TransferDestinationPayload
   return unwrapApiResponse(response)
 }
 
+export async function updateLastMileOrderPalletMerge(orderIds: string[], customerId: string, palletMergeRequired: boolean) {
+  const response = await http.put<ApiEnvelope<null>, ApiEnvelope<null>>(
+    '/platform/v1/last-leg/orders/pallet-merge-required/batch',
+    { orderIds, palletMergeRequired },
+    { params: { customerId } },
+  )
+  return unwrapApiResponse(response)
+}
+
 export async function listContainerPlanProgress(query: ContainerPlanProgressQuery): Promise<OverseasPageResult<ContainerPlanProgressSummaryDto>> {
   const response = await http.get<ApiEnvelope<OverseasPagePayload<ContainerPlanProgressSummaryDto>>, ApiEnvelope<OverseasPagePayload<ContainerPlanProgressSummaryDto>>>(
     '/platform/v1/last-leg/orders/container-summaries',
diff --git a/src/modules/overseas-warehouse/pages/LastMileOrdersView.behavior.test.ts b/src/modules/overseas-warehouse/pages/LastMileOrdersView.behavior.test.ts
index 2cd7ef0d..25c76e1a 100644
--- a/src/modules/overseas-warehouse/pages/LastMileOrdersView.behavior.test.ts
+++ b/src/modules/overseas-warehouse/pages/LastMileOrdersView.behavior.test.ts
@@ -21,6 +21,7 @@ import {
   listLastMileOrders,
   reviewCargoDiscard,
   transferLastMileOrders,
+  updateLastMileOrderPalletMerge,
   getLastMileOrderManualNodes,
   updateLastMileOrderHold,
   updateLastMileOrderManualNodes,
@@ -38,7 +39,7 @@ vi.mock('../api/lastMileOrders', () => ({
   changeContainerReceivingWarehouse: vi.fn(),
   createManualInboundPlan: vi.fn(), convertLastMileContainerToInboundPlans: vi.fn(), getContainerInboundPlanPreview: vi.fn(), transferLastMileOrders: vi.fn(),
   getLastMileOrderManualNodes: vi.fn(), updateLastMileOrderHold: vi.fn(), updateLastMileOrderManualNodes: vi.fn(),
-  reviewCargoDiscard: vi.fn(),
+  reviewCargoDiscard: vi.fn(), updateLastMileOrderPalletMerge: vi.fn(),
 }))
 
 class ResizeObserverStub implements ResizeObserver { observe() {} unobserve() {} disconnect() {} }
@@ -1189,3 +1190,40 @@ describe('LastMileOrdersView pending order and container conversion', () => {
     expect(routerPush).toHaveBeenCalledWith({ name: 'overseas-return-inventory', query: expect.objectContaining({ packing: '1', returnNos: 'RETURN-1' }) })
   })
 })
+
+ describe('tail-leg pallet merge toolbar', () => {
+  beforeEach(() => {
+    canAccess.mockImplementation(() => true)
+    vi.mocked(listLastMileOrders).mockResolvedValue({ records: [], page: 1, size: 10, total: 0, pages: 0 })
+    vi.mocked(updateLastMileOrderPalletMerge).mockReset().mockResolvedValue(null)
+  })
+  it('submits the selected group and cancellation with the customer scope', async () => {
+    vi.spyOn(ElMessageBox, 'confirm').mockResolvedValue('confirm' as Awaited<ReturnType<typeof ElMessageBox.confirm>>)
+    const wrapper = await mountView()
+    const row = { id: '2092873463568596994', customerId, currentStatusCode: 'PENDING_ASSIGNMENT', palletMergeFlag: '' }
+    expect(wrapper.findAll('button').find(b => b.text() === '合托')!.attributes('disabled')).toBeDefined()
+    await selectRows(wrapper, [row])
+    await wrapper.findAll('button').find(b => b.text() === '合托')!.trigger('click')
+    await flushPromises()
+    expect(updateLastMileOrderPalletMerge).toHaveBeenLastCalledWith([row.id], customerId, true)
+    await selectRows(wrapper, [{ ...row, palletMergeFlag: 'REQUIRED' }])
+    await wrapper.findAll('button').find(b => b.text() === '取消合托')!.trigger('click')
+    await flushPromises()
+    expect(updateLastMileOrderPalletMerge).toHaveBeenLastCalledWith([row.id], customerId, false)
+  })
+  it('blocks completed and mixed-customer selections and hides unauthorized actions', async () => {
+    const wrapper = await mountView()
+    for (const rows of [
+      [{ id: '1', customerId, currentStatusCode: 'INBOUND_COMPLETED', palletMergeFlag: 'REQUIRED' }],
+      [{ id: '1', customerId, palletMergeFlag: 'MERGED' }],
+      [{ id: '1', customerId }, { id: '2', customerId: 'other' }],
+    ]) {
+      await selectRows(wrapper, rows)
+      expect(wrapper.findAll('button').find(b => b.text() === '合托')!.attributes('disabled')).toBeDefined()
+      expect(wrapper.findAll('button').find(b => b.text() === '取消合托')!.attributes('disabled')).toBeDefined()
+    }
+    canAccess.mockImplementation(() => false)
+    const denied = await mountView()
+    expect(denied.findAll('button').some(b => b.text() === '合托' || b.text() === '取消合托')).toBe(false)
+  })
+})
diff --git a/src/modules/overseas-warehouse/pages/LastMileOrdersView.vue b/src/modules/overseas-warehouse/pages/LastMileOrdersView.vue
index f73473c0..f33eab86 100644
--- a/src/modules/overseas-warehouse/pages/LastMileOrdersView.vue
+++ b/src/modules/overseas-warehouse/pages/LastMileOrdersView.vue
@@ -16,7 +16,7 @@ import LoadErrorState from '@/shared/components/LoadErrorState.vue'
 import OperationErrorToast from '@/shared/components/OperationErrorToast.vue'
 import QueryToolbar, { type QueryField, type QueryModel } from '@/shared/components/QueryToolbar.vue'
 import RowActions, { type RowActionItem } from '@/shared/components/RowActions.vue'
-import { changeContainerReceivingWarehouse, convertLastMileContainerToInboundPlans, createManualInboundPlan, getContainerInboundPlanPreview, getContainerPlanProgress, getLastMileOrderManualNodes, listContainerPlanProgress, listLastMileOrders, reviewDirectRelabelOrder, reviewReturnOrder, transferLastMileOrders, updateLastMileOrderHold, updateLastMileOrderManualNodes, type ContainerInboundPlanPreviewDto, type ContainerInboundPlanPreviewGroupDto, type ContainerInboundPlanPreviewOrderDto, type ContainerPlanProgressDetailDto, type ContainerPlanProgressSummaryDto, type ManualNodeCode, type LastMileOrderQuery } from '../api/lastMileOrders'
+import { changeContainerReceivingWarehouse, convertLastMileContainerToInboundPlans, createManualInboundPlan, getContainerInboundPlanPreview, getContainerPlanProgress, getLastMileOrderManualNodes, listContainerPlanProgress, listLastMileOrders, reviewDirectRelabelOrder, reviewReturnOrder, transferLastMileOrders, updateLastMileOrderPalletMerge, updateLastMileOrderHold, updateLastMileOrderManualNodes, type ContainerInboundPlanPreviewDto, type ContainerInboundPlanPreviewGroupDto, type ContainerInboundPlanPreviewOrderDto, type ContainerPlanProgressDetailDto, type ContainerPlanProgressSummaryDto, type ManualNodeCode, type LastMileOrderQuery } from '../api/lastMileOrders'
 import { businessOrderLink } from '../businessOrderLink'
 import OrderReferenceText from '../components/OrderReferenceText.vue'
 import { reviewCargoDiscard } from '../api/lastMileOrders'
@@ -64,6 +64,33 @@ function openReturnPackingPlan() {
 const exportLoading = ref(false)
 const actionLoading = ref(false)
 async function exportOrders() { exportLoading.value = true; try { await submitExport('LAST_MILE_ORDER_LIST', '尾程订单', orderQuery()) } catch (cause) { ElMessage.error(getApiErrorDetails(cause, '尾程订单导出失败，请重试').message) } finally { exportLoading.value = false } }
+const palletMergeSelectionEditable = computed(() => selectedRows.value.length > 0
+  && selectedRows.value.every(row => row.customerId && row.currentStatusCode !== 'INBOUND_COMPLETED' && row.palletMergeFlag !== 'MERGED')
+  && new Set(selectedRows.value.map(row => row.customerId)).size === 1)
+const canCancelPalletMerge = computed(() => palletMergeSelectionEditable.value
+  && selectedRows.value.every(row => row.palletMergeFlag === 'REQUIRED'))
+async function submitPalletMerge(required: boolean) {
+  if (actionLoading.value || !access.can(permission.lastMileOrderPalletMerge)
+    || !(required ? palletMergeSelectionEditable.value : canCancelPalletMerge.value)) return
+  const selection = [...selectedRows.value]
+  const label = required ? '合托' : '取消合托'
+  try {
+    await ElMessageBox.confirm(required
+      ? `将勾选的 ${selection.length} 票订单标记为同一合托组？所选订单须属于同一客户、同一目的仓，PDA 将提示现场合托。`
+      : `取消勾选的 ${selection.length} 票订单的合托标记和 PDA 提示？`, label,
+    { customClass: 'admin-density-confirm', confirmButtonText: `确认${label}`, cancelButtonText: '返回', type: 'warning' })
+  } catch { return }
+  actionLoading.value = true
+  actionError.value = null
+  try {
+    await updateLastMileOrderPalletMerge(selection.map(row => row.id), selection[0]!.customerId, required)
+    ElMessage.success(required ? '已标记合托' : '已取消合托标记')
+    selectedRows.value = []
+    await load()
+  } catch (cause) {
+    actionError.value = getApiErrorDetails(cause, `${label}失败，请重试`)
+  } finally { actionLoading.value = false }
+}
 const actionError = ref<ApiErrorDetails | null>(null)
 const actionTarget = ref<LastMileOrderListItem | null>(null)
 const inboundPlanOpen = ref(false)
@@ -1108,7 +1135,7 @@ onMounted(() => { void load() })
       </div>
     </section></template>
 
-      <template v-if="statusTab !== '柜子'" #toolbar-actions><el-button v-if="selectedReturnRows.length" type="warning" @click="openReturnPackingPlan"><PackagePlus :size="16" />创建退货合箱计划（{{ selectedReturnRows.length }}）</el-button><el-button v-if="access.can(permission.lastMileOrderExport) && access.can('platform:download:list')" plain :loading="exportLoading" @click="exportOrders"><Download :size="16" />导出订单</el-button><el-button v-if="access.can(permission.lastMileOrderTransfer)" plain :disabled="!selectedRows.length || hasSelectedRejectedReturn() || actionLoading" @click="openTransfer">转仓</el-button><el-button v-if="access.can(permission.inboundOrderCreate) && selectedRows.length === 1 && canGenerateInboundPlan(selectedRows[0])" type="primary" plain :disabled="hasSelectedInboundPlan() || actionLoading" @click="openInboundPlan()">生成入库计划</el-button><el-button v-if="access.can(permission.inboundOrderCreate)" type="primary" :disabled="actionLoading" @click="openContainerConversion">按柜批量生成</el-button></template>
+      <template v-if="statusTab !== '柜子'" #toolbar-actions><el-button v-if="access.can(permission.lastMileOrderPalletMerge)" plain :disabled="!palletMergeSelectionEditable || actionLoading" @click="submitPalletMerge(true)">合托</el-button><el-button v-if="access.can(permission.lastMileOrderPalletMerge)" plain :disabled="!canCancelPalletMerge || actionLoading" @click="submitPalletMerge(false)">取消合托</el-button><el-button v-if="selectedReturnRows.length" type="warning" @click="openReturnPackingPlan"><PackagePlus :size="16" />创建退货合箱计划（{{ selectedReturnRows.length }}）</el-button><el-button v-if="access.can(permission.lastMileOrderExport) && access.can('platform:download:list')" plain :loading="exportLoading" @click="exportOrders"><Download :size="16" />导出订单</el-button><el-button v-if="access.can(permission.lastMileOrderTransfer)" plain :disabled="!selectedRows.length || hasSelectedRejectedReturn() || actionLoading" @click="openTransfer">转仓</el-button><el-button v-if="access.can(permission.inboundOrderCreate) && selectedRows.length === 1 && canGenerateInboundPlan(selectedRows[0])" type="primary" plain :disabled="hasSelectedInboundPlan() || actionLoading" @click="openInboundPlan()">生成入库计划</el-button><el-button v-if="access.can(permission.inboundOrderCreate)" type="primary" :disabled="actionLoading" @click="openContainerConversion">按柜批量生成</el-button></template>
       <template #relabelOrderNo="{ row }"><div v-for="application in row.relabelApplications" :key="application.relabelNo" class="relabel-suborder">{{ application.relabelNo }}</div><span v-if="!row.relabelApplications?.length">{{ row.relabelOrderNo }}</span></template>
       <template #relabelStatus="{ row }"><div v-for="application in row.relabelApplications" :key="application.relabelNo" class="relabel-suborder">{{ application.statusLabel }} · {{ application.quantity }} 件</div><span v-if="!row.relabelApplications?.length">{{ row.relabelStatus }}</span></template>
       <template #actions="{ row }"><RowActions text-actions :actions="lastMileRowActions(row as LastMileOrderListItem)" :more-label="`更多尾程订单操作 · ${(row as LastMileOrderListItem).orderNo || '当前记录'}`" @action="handleLastMileRowAction($event, row as LastMileOrderListItem)" /></template>
diff --git a/src/modules/overseas-warehouse/permissions.ts b/src/modules/overseas-warehouse/permissions.ts
index 64c2523b..8dcd5cf5 100644
--- a/src/modules/overseas-warehouse/permissions.ts
+++ b/src/modules/overseas-warehouse/permissions.ts
@@ -2,6 +2,7 @@ export const overseasWarehousePermissions = {
   lastMileOrderList: 'platform:overseas-warehouse:last-mile-order:list',
   lastMileOrderExport: 'platform:overseas-warehouse:last-mile-order:export',
   lastMileOrderTransfer: 'platform:overseas-warehouse:last-mile-order:edit',
+  lastMileOrderPalletMerge: 'platform:overseas-warehouse:last-mile-order:edit',
   warehouseTransferApprove: 'platform:overseas-warehouse:warehouse-transfer:approve',
   cargoDiscardApprove: 'lastleg:cargo-discard:approve',
   inboundOrderList: 'platform:overseas-warehouse:inbound-order:list',