diff --git a/CHANGELOG-server.md b/CHANGELOG-server.md
index bfca1d6..e46daf1 100644
--- a/CHANGELOG-server.md
+++ b/CHANGELOG-server.md
@@ -5,6 +5,11 @@
 The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/),
 and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
 
+## [1.0.76] - 2026-06-22
+
+### 修复
+- 修复「编辑入库单草稿后合计金额变成 0」的问题：此前每次编辑草稿会把单据合计金额错误清零（明细的单价/金额正常，仅单据头合计未重算），现已按明细正确重算。
+
 ## [1.0.75] - 2026-06-22
 
 ### 新功能
diff --git a/backend/internal/handler/stock_in.go b/backend/internal/handler/stock_in.go
index 860a16f..6416762 100644
--- a/backend/internal/handler/stock_in.go
+++ b/backend/internal/handler/stock_in.go
@@ -172,6 +172,7 @@ func (h *StockInHandler) Update(c *gin.Context) {
 			it.ProductID = prod.ID
 			it.ProductCode = prod.Code
 			it.TotalPrice = it.Quantity * it.UnitPrice
+			total += it.TotalPrice
 		}
 		updates := map[string]interface{}{
 			"warehouse_id": req.WarehouseID,
diff --git a/backend/internal/handler/stock_in_test.go b/backend/internal/handler/stock_in_test.go
index 77cc4fb..eb869e7 100644
--- a/backend/internal/handler/stock_in_test.go
+++ b/backend/internal/handler/stock_in_test.go
@@ -272,6 +272,44 @@ func TestStockInHandler_TotalAmount(t *testing.T) {
 	assert.Equal(t, float64(110), data["total_amount"])
 }
 
+// 回归：编辑草稿入库单后 total_amount 必须按新明细重算（此前 Update 漏了累加，编辑后被清成 0）。
+func TestStockInHandler_UpdateRecomputesTotal(t *testing.T) {
+	db := testutil.SetupTestDB()
+	shop := testutil.CreateTestShop(db, "SI_UPD")
+	user := testutil.CreateTestUser(db, shop.ID, "admin", "pass", "admin")
+	warehouse := testutil.CreateTestWarehouse(db, shop.ID, "Warehouse")
+	token := getAuthToken(user.ID, shop.ID, "admin")
+	r := setupProtectedRouter(db)
+
+	// 建草稿：1 行 10×5 = 50
+	w := makeRequest(r, "POST", "/api/v1/stock-in/orders", token, map[string]interface{}{
+		"warehouse_id": warehouse.ID,
+		"order_date":   time.Now().Format(time.RFC3339),
+		"items": []map[string]interface{}{
+			{"product_name": "茅台", "series": "飞天", "spec": "500ml", "quantity": 10.0, "unit_price": 5.0},
+		},
+	})
+	require.Equal(t, http.StatusCreated, w.Code)
+	orderID := extractID(w)
+
+	// 编辑：改成 2 行 12×3100 + 1×4500 = 41700
+	w = makeRequest(r, "PUT", fmt.Sprintf("/api/v1/stock-in/orders/%d", orderID), token, map[string]interface{}{
+		"warehouse_id": warehouse.ID,
+		"order_date":   time.Now().Format(time.RFC3339),
+		"items": []map[string]interface{}{
+			{"product_name": "茅台2009", "series": "大件", "spec": "500ml", "quantity": 12.0, "unit_price": 3100.0},
+			{"product_name": "茅台十五年", "series": "大件", "spec": "500ml", "quantity": 1.0, "unit_price": 4500.0},
+		},
+	})
+	require.Equal(t, http.StatusOK, w.Code)
+
+	// 取详情核对 total_amount 已重算（不是 0）
+	w = makeRequest(r, "GET", fmt.Sprintf("/api/v1/stock-in/orders/%d", orderID), token, nil)
+	require.Equal(t, http.StatusOK, w.Code)
+	data := parseResponse(w)["data"].(map[string]interface{})
+	assert.Equal(t, float64(41700), data["total_amount"], "编辑后金额应按新明细重算")
+}
+
 func TestStockInHandler_NoAuth(t *testing.T) {
 	db := testutil.SetupTestDB()
 	r := setupProtectedRouter(db)
diff --git a/backend/internal/handler/testhelper_test.go b/backend/internal/handler/testhelper_test.go
index a48b0de..25f2c58 100644
--- a/backend/internal/handler/testhelper_test.go
+++ b/backend/internal/handler/testhelper_test.go
@@ -60,6 +60,7 @@ func setupProtectedRouter(db *gorm.DB) *gin.Engine {
 	stockIn.GET("/orders", stockInH.List)
 	stockIn.GET("/orders/:id", stockInH.Get)
 	stockIn.POST("/orders", stockInH.Create)
+	stockIn.PUT("/orders/:id", stockInH.Update)
 	stockIn.PUT("/orders/:id/submit", stockInH.Submit)
 	stockIn.PUT("/orders/:id/approve", stockInH.Approve)
 	stockIn.PUT("/orders/:id/reject", stockInH.Reject)
@@ -71,6 +72,7 @@ func setupProtectedRouter(db *gorm.DB) *gin.Engine {
 	stockOut.GET("/orders", stockOutH.List)
 	stockOut.GET("/orders/:id", stockOutH.Get)
 	stockOut.POST("/orders", stockOutH.Create)
+	stockOut.PUT("/orders/:id", stockOutH.Update)
 	stockOut.PUT("/orders/:id/submit", stockOutH.Submit)
 	stockOut.PUT("/orders/:id/approve", stockOutH.Approve)
 	stockOut.PUT("/orders/:id/reject", stockOutH.Reject)