打开wp-admin/includes/file.php文件
找到wp_handle_upload这个函数,按照下面的代码进行修改.主要修改两行

function wp_handle_upload( &$file, $overrides = false, $time = null ) {
        //部分代码略去
        // Move the file to the uploads dir
        //$new_file = $uploads['path'] . "/$filename";
        //将上行代码修改为下面的代码,修正中文文件名编码问题
        $new_file = $uploads['path'] . "/" . iconv("UTF-8","GB2312",$filename);
       
       //部分代码略去
       
       //return apply_filters( 'wp_handle_upload', array( 'file' => $new_file, 'url' => $url, 'type' => $type ), 'upload' );
       //将上行代码修改为下面的代码,修正中文文件名编码问题
       return apply_filters( 'wp_handle_upload', array( 'file' => $uploads['path'] . "/$filename", 'url' => $url, 'type' => $type ) , 'upload');
}