diff --git a/src/main/java/com/gaotao/modules/labelSplitMerge/service/impl/LabelSplitMergeServiceImpl.java b/src/main/java/com/gaotao/modules/labelSplitMerge/service/impl/LabelSplitMergeServiceImpl.java
index 1795363..7868c8b 100644
--- a/src/main/java/com/gaotao/modules/labelSplitMerge/service/impl/LabelSplitMergeServiceImpl.java
+++ b/src/main/java/com/gaotao/modules/labelSplitMerge/service/impl/LabelSplitMergeServiceImpl.java
@@ -83,7 +83,13 @@ public class LabelSplitMergeServiceImpl extends ServiceImpl<LabelSplitMergeMappe
             String locationId = (String) params.get("locationId");
             String operator = (String) params.get("operator");
 
-            Float originalQuantity = Float.parseFloat(params.get("originalQuantity").toString());
+            // 1. 获取当前库存信息，防止前端数据过期或重复提交
+            Map<String, Object> currentStock = labelSplitMergeMapper.getStockInfoByLabelCode(originalLabelCode, site, warehouseId);
+            if (currentStock == null) {
+                throw new RuntimeException("未找到原标签库存信息");
+            }
+            Float originalQuantity = Float.parseFloat(currentStock.get("qtyOnHand").toString());
+
             // 获取拆分张数，默认为1（兼容旧版本）
             Integer splitCount = params.get("splitCount") != null ? Integer.parseInt(params.get("splitCount").toString()) : 1;
             Float splitQuantity = Float.parseFloat(params.get("splitQuantity").toString());