您可以通过pre_get_posts 钩

function wpse163459_search_exclude_post_format( $query ) {
    if( $query->is_main_query() && $query->is_search() ) {
        $tax_query = array( array(
            \'taxonomy\' => \'post_format\',
            \'field\' => \'slug\',
            \'terms\' => array( \'post-format-quote\' ),
            \'operator\' => \'NOT IN\',
         ) );
         $query->set( \'tax_query\', $tax_query );
    }

}
add_action( \'pre_get_posts\', \'wpse163459_search_exclude_post_format\' );