diff --git a/delete_than24.sh b/delete_than24.sh
new file mode 100755
index 0000000..690b7a2
--- /dev/null
+++ b/delete_than24.sh
@@ -0,0 +1,19 @@
+#!/bin/bash  
+set -e
+# 指定文件夹路径  
+folder="/home/pi/mp4"
+
+# 获取文件夹的大小  
+size=$(du -sh "$folder" | awk '{print int($1/1024/1024)}')
+while [[ $size -gt 24 ]]
+do
+  # 获取最早创建的文件
+  oldest_file=$(ls -tr | head -1 | xargs)
+  rm -f $oldest_file
+  size=$(du -sh "$folder" | awk '{print int($1/1024/1024)}')
+  if [[ $size -le 24 ]]
+  then
+    exit 0
+  fi
+done
+