diff --git a/style/components/cascader.less b/style/components/cascader.less
index dfc2b9d7b9..b21524bf36 100644
--- a/style/components/cascader.less
+++ b/style/components/cascader.less
@@ -94,6 +94,7 @@
     margin: 0;
     padding: 0;
     border-right: 1px solid @border-color-split;
+    overflow: auto;
     &:last-child {
       border-right-color: transparent;
       margin-right: -1px;