How to remove the tags using Meta in angular 4

The attribute selector that you are trying to use is name, not property.

You have to use

this.metaService.removeTag("name='og:title'");
this.metaService.removeTag("name='og:site_name'");
this.metaService.removeTag("name='og:url'");
this.metaService.removeTag("name='og:description'");

instead of

this.metaService.removeTag("property='og:title'");
this.metaService.removeTag("property='og:site_name'");
this.metaService.removeTag("property='og:url'");
this.metaService.removeTag("property='og:description'");

plnkr