diff --git a/packages/theme-chalk/src/message-box.scss b/packages/theme-chalk/src/message-box.scss
index 3b19a8844c..bec89eeb0e 100644
--- a/packages/theme-chalk/src/message-box.scss
+++ b/packages/theme-chalk/src/message-box.scss
@@ -106,6 +106,7 @@
     + .#{$namespace}-message-box__message {
       padding-left: 36px;
       padding-right: 12px;
+      word-break: break-word;
     }
 
     @each $type in (success, info, warning, error) {