diff --git a/inventory-backend/app/api/v1/inbound/stock.py b/inventory-backend/app/api/v1/inbound/stock.py
index 71d8b93..5b683ec 100644
--- a/inventory-backend/app/api/v1/inbound/stock.py
+++ b/inventory-backend/app/api/v1/inbound/stock.py
@@ -477,12 +477,17 @@ def get_drafts():
     limit = request.args.get('limit', 20, type=int)
     keyword = request.args.get('keyword', '', type=str)
     session_id = request.args.get('session_id')
+    uuid = request.args.get('uuid', '', type=str)
 
     query = StocktakeDraft.query
 
     if session_id:
         query = query.filter_by(session_id=session_id)
 
+    # ★ 按 uuid 精确过滤（扫码时检测该物料是否已盘）
+    if uuid:
+        query = query.filter_by(uuid=uuid)
+
     # 先执行查询获取所有记录
     drafts = query.all()
 
diff --git a/inventory-web/src/views/stock/stocktake/index.vue b/inventory-web/src/views/stock/stocktake/index.vue
index 2b5c3ba..464077e 100644
--- a/inventory-web/src/views/stock/stocktake/index.vue
+++ b/inventory-web/src/views/stock/stocktake/index.vue
@@ -861,15 +861,58 @@ const handleManualInput = async () => {
   }
 }
 
-const openQtyDialog = (item: StockItem) => {
-  currentItem.value = item
-  inputQty.value = item.scanned ? item.qty_actual : 1
-  showQtyDialog.value = true
+const openQtyDialog = async (item: StockItem) => {
+  // ★ 重复扫码检测：精确查该物料是否已在本 session 盘过
+  let existingQty: number | null = null
+  try {
+    const uuidForQuery = item.uuid || item.sku || ''
+    const dupRes: any = await request({
+      url: '/v1/inbound/stock/draft/list',
+      method: 'get',
+      params: { session_id: currentSessionId.value, uuid: uuidForQuery, limit: 1 }
+    })
+    const dupItems = dupRes?.items || dupRes?.data?.items || []
+    if (dupItems.length > 0 && dupItems[0].quantity !== undefined) {
+      existingQty = Number(dupItems[0].quantity)
+    }
+  } catch (e) {
+    // 查询失败不阻断，视为未盘过
+  }
 
-  nextTick(() => {
-    const inputEl = document.querySelector('.qty-dialog input') as HTMLInputElement
-    if(inputEl) inputEl.focus()
-  })
+  if (existingQty !== null) {
+    // 已盘过 → 提示当前值，询问是否修改
+    try {
+      await ElMessageBox.confirm(
+        `⚠️ 【${item.name} × ${item.standard}】已盘过，当前实盘为 ${existingQty}。\n\n是否修改本次盘点的数量？`,
+        '重复扫码提示',
+        {
+          confirmButtonText: '修改数量',
+          cancelButtonText: '取消',
+          type: 'warning'
+        }
+      )
+      // 用户确认修改 → 预填当前值，弹输入框
+      currentItem.value = item
+      inputQty.value = existingQty || 1
+      showQtyDialog.value = true
+      nextTick(() => {
+        const inputEl = document.querySelector('.qty-dialog input') as HTMLInputElement
+        if(inputEl) inputEl.focus()
+      })
+    } catch (e) {
+      // 用户取消，不修改
+      return
+    }
+  } else {
+    // 未盘过 → 正常弹输入框
+    currentItem.value = item
+    inputQty.value = item.scanned ? item.qty_actual : 1
+    showQtyDialog.value = true
+    nextTick(() => {
+      const inputEl = document.querySelector('.qty-dialog input') as HTMLInputElement
+      if(inputEl) inputEl.focus()
+    })
+  }
 }
 
 const handleManualConfirm = () => {