The invention discloses a post-curing method of a long-stator iron core. The post-curing method includes steps of removing scraped edges of the iron core, curing the iron core and cooling the iron core. By the post-curing method of the long-stator iron core, a long stator is an important device of the linear motor so as to realize domestication and industrialization, and great benefits are brought for development of linear motors from time and cost.