您可以使用detect\\u plugin\\u deactivation，

function detect_plugin_deactivation(  $plugin, $network_activation ) {
    if ($plugin=="parentplugin/parentplugin.php")
    {
        deactivate_plugins(plugin_basename(__FILE__));
    }
}
add_action( \'deactivated_plugin\', \'detect_plugin_deactivation\', 10, 2 );