diff --git a/ruoyi-common/ruoyi-common-excel/src/main/java/org/dromara/common/excel/convert/ExcelBigNumberConvert.java b/ruoyi-common/ruoyi-common-excel/src/main/java/org/dromara/common/excel/convert/ExcelBigNumberConvert.java
index c6beb5537..b88c3e429 100644
--- a/ruoyi-common/ruoyi-common-excel/src/main/java/org/dromara/common/excel/convert/ExcelBigNumberConvert.java
+++ b/ruoyi-common/ruoyi-common-excel/src/main/java/org/dromara/common/excel/convert/ExcelBigNumberConvert.java
@@ -28,7 +28,7 @@ public class ExcelBigNumberConvert implements Converter<Long> {
 
     @Override
     public CellDataTypeEnum supportExcelTypeKey() {
-        return CellDataTypeEnum.STRING;
+        return null;
     }
 
     @Override