您应该能够使用comment_form_defaults 滤器

以下是一个未经测试的示例：

add_filter( \'comment_form_defaults\', function( $defaults )
{
    // Edit this to your needs:
    $button = \'<input name="%1$s" type="submit" id="%2$s" class="%3$s" value="%4$s" />\';

    // Override the default submit button:
    $defaults[\'submit_button\'] = $button;

    return $defaults;
} );

还有comment_form_submit_button 过滤器：

add_filter( \'comment_form_submit_button\', function( $submit_button, $args )
{
    // Override the submit button HTML:
    $button = \'<input name="%1$s" type="submit" id="%2$s" class="%3$s" value="%4$s" />\';

    return sprintf(
        $button,
        esc_attr( $args[\'name_submit\'] ),
        esc_attr( $args[\'id_submit\'] ),
        esc_attr( $args[\'class_submit\'] ),
        esc_attr( $args[\'label_submit\'] )
     );

}, 10, 2 );