diff --git a/apps/backend/src/db/migrations/114_work_order_share_cancel_reason_comment.sql b/apps/backend/src/db/migrations/114_work_order_share_cancel_reason_comment.sql
new file mode 100644
index 00000000..a14a84df
--- /dev/null
+++ b/apps/backend/src/db/migrations/114_work_order_share_cancel_reason_comment.sql
@@ -0,0 +1,6 @@
+-- 114_work_order_share_cancel_reason_comment.sql
+-- 「取消部分」把被撤销的份额标记为 admin_partial，校准 cancelled_reason 的枚举注释。
+-- 纯注释变更，无结构/数据改动；重复执行无副作用。
+
+COMMENT ON COLUMN work_order_shares.cancelled_reason IS
+  '取消来源：timeout/worker_request/admin/admin_partial/problem/settlement';
diff --git a/apps/frontend/src/pages/admin/panels/shared.tsx b/apps/frontend/src/pages/admin/panels/shared.tsx
index f7860925..82ba6531 100644
--- a/apps/frontend/src/pages/admin/panels/shared.tsx
+++ b/apps/frontend/src/pages/admin/panels/shared.tsx
@@ -252,17 +252,6 @@ export function formatSharingShareStatus(status: string) {
   return labels[status] || status
 }
 
-/** 撤单原因：份额级独立撤单后，后台需要一眼看出是谁撤的。 */
-export function formatSharingShareCancelledReason(reason: string) {
-  const labels: Record<string, string> = {
-    timeout: '超时失效',
-    admin: '后台撤单',
-    worker_request: '打手退单',
-    problem: '问题单处置',
-  }
-  return labels[reason] || reason
-}
-
 export function formatAcceptanceMode(mode: string) {
   if (mode === 'friend_gift') return '好友赠送'
   return '标准验收'
@@ -271,6 +260,9 @@ export function formatAcceptanceMode(mode: string) {
 // 阶段文案与配色在 utils 里实现，便于单测覆盖「内部现货单显示待加好友」这条口径。
 export { formatGiftPhase, resolveGiftPhaseColor } from '@/utils/gift-phase'
 
+// 取消来源文案同样抽到 utils，避免新增枚举值时漏映射（admin_partial 就踩过）。
+export { formatSharingShareCancelledReason } from '@/utils/worker-share-cancel-reason'
+
 export function resolveSharingShareStatusColor(status: string) {
   if (status === 'accepted') return 'green'
   if (status === 'submitted') return 'gold'
diff --git a/apps/frontend/src/utils/worker-share-cancel-reason.ts b/apps/frontend/src/utils/worker-share-cancel-reason.ts
new file mode 100644
index 00000000..492cb289
--- /dev/null
+++ b/apps/frontend/src/utils/worker-share-cancel-reason.ts
@@ -0,0 +1,20 @@
+/**
+ * 拼单份额取消来源的中文标签。
+ *
+ * 后端 `work_order_shares.cancelled_reason` 使用英文枚举：
+ * timeout / worker_request / admin / admin_partial / problem / settlement。
+ * 新增来源时必须同步这里，否则后台「拼单明细」会直接显示原始值。
+ */
+export const SHARE_CANCEL_REASON_LABELS: Record<string, string> = {
+  timeout: '超时失效',
+  admin: '后台撤单',
+  admin_partial: '后台取消部分',
+  worker_request: '打手退单',
+  problem: '问题单处置',
+  settlement: '结算处置',
+}
+
+/** 撤单原因：份额级独立撤单后，后台需要一眼看出是谁撤的。 */
+export function formatSharingShareCancelledReason(reason: string) {
+  return SHARE_CANCEL_REASON_LABELS[reason] || reason
+}
diff --git a/apps/frontend/tests/worker-share-cancel-reason.test.ts b/apps/frontend/tests/worker-share-cancel-reason.test.ts
new file mode 100644
index 00000000..d546c82a
--- /dev/null
+++ b/apps/frontend/tests/worker-share-cancel-reason.test.ts
@@ -0,0 +1,32 @@
+import assert from 'node:assert/strict'
+import test from 'node:test'
+
+import {
+  SHARE_CANCEL_REASON_LABELS,
+  formatSharingShareCancelledReason,
+} from '../src/utils/worker-share-cancel-reason.ts'
+
+test('拼单取消来源：已知枚举值都必须有中文标签', () => {
+  for (const reason of [
+    'timeout',
+    'admin',
+    'admin_partial',
+    'worker_request',
+    'problem',
+    'settlement',
+  ]) {
+    const label = formatSharingShareCancelledReason(reason)
+    assert.notEqual(label, reason, `${reason} 缺少中文映射`)
+    assert.equal(label, SHARE_CANCEL_REASON_LABELS[reason])
+    assert.ok(label.trim().length > 0)
+  }
+})
+
+test('拼单取消来源：取消部分必须映射为后台取消部分', () => {
+  assert.equal(formatSharingShareCancelledReason('admin_partial'), '后台取消部分')
+})
+
+test('拼单取消来源：未知值保留原始值，便于排查', () => {
+  assert.equal(formatSharingShareCancelledReason('some_new_reason'), 'some_new_reason')
+  assert.equal(formatSharingShareCancelledReason(''), '')
+})