WP-Conditional_post_type_admin_screens

gistfile1.php

<?php
add_action( 'admin_enqueue_scripts', 'load_admin_custom_script' );

function load_admin_custom_script() {

    $current_screen = get_current_screen();

    if ( $current_screen->post_type === 'custom_post_type_name' )  {
        $ss_url = get_bloginfo('stylesheet_directory');
        wp_enqueue_script('jquery');
        wp_enqueue_script('custom_js', '{$ss_url}/path-to-file/filename.js', array('jquery'));
    }

}
?>