diff --git a/components/cascader/__tests__/__snapshots__/demo.test.js.snap b/components/cascader/__tests__/__snapshots__/demo.test.js.snap
index acb0760e8e..2488d09518 100644
--- a/components/cascader/__tests__/__snapshots__/demo.test.js.snap
+++ b/components/cascader/__tests__/__snapshots__/demo.test.js.snap
@@ -211,7 +211,7 @@ exports[`renders ./components/cascader/demo/lazy.md correctly 1`] = `
 
 exports[`renders ./components/cascader/demo/search.md correctly 1`] = `
 <span
-  class="ant-cascader-picker"
+  class="ant-cascader-picker ant-cascader-picker-show-search"
   tabindex="0"
 >
   <span
diff --git a/components/cascader/index.tsx b/components/cascader/index.tsx
index 5c4de27a3b..65cf0b33f1 100644
--- a/components/cascader/index.tsx
+++ b/components/cascader/index.tsx
@@ -359,6 +359,7 @@ export default class Cascader extends React.Component<CascaderProps, CascaderSta
       [`${prefixCls}-picker-with-value`]: state.inputValue,
       [`${prefixCls}-picker-disabled`]: disabled,
       [`${prefixCls}-picker-${size}`]: !!size,
+      [`${prefixCls}-picker-show-search`]: !!showSearch,
     });
 
     // Fix bug of https://github.com/facebook/react/pull/5004
diff --git a/components/cascader/style/index.less b/components/cascader/style/index.less
index bd71d4e7d2..73c0b32b62 100644
--- a/components/cascader/style/index.less
+++ b/components/cascader/style/index.less
@@ -17,6 +17,10 @@
     position: static;
   }
 
+  &-picker-show-search &-input.@{ant-prefix}-input {
+    position: relative;
+  }
+
   &-picker {
     .reset-component;
     position: relative;