I have a problem with my WordPress site.Google does not crwal it.what i do.
Will you submit your xml sitemap on SE via webmaster tool. If your site newly created then it happens. If you not have xml sitemap, create it by free tool and opload it on SE and place that file in your root directory.
I Agree on what @Ketul_1 said.. sitemap is helpful for your website to get indexed by search engines.
For more info, below is a link regarding sitemap.
Try creating the sitemap again and try submitting it over the webmaster tool. I think there may be some problem with the sitemap which makes the site in accessible for Google Crawlers. Also check over the robots.txt file for anything fishy.