Add the jQuery only when the custom post type

functions.php

function my_jquery($hook) {
	if($hook == 'edit.php'){
	  global $post;
    if ( $hook == 'post-new.php' || $hook == 'post.php' ) {
        if ( 'custom_post_name' === $post->post_type ) {
        	wp_enqueue_script('custom_admin_script', get_bloginfo('template_url').'/js/my_jquery.js', array('jquery'));
        }
	  }
	}
}
add_action('admin_enqueue_scripts', 'my_jquery');