Yuwu coal preparation plant adopts dynamic sieve jig process to discharge gangue.Due to the poor sorting effect of mechanical dynamic sieve jig,there is a problem that gangue carries too much coal,which is easy to cause social problems such as environmental protection,safety and public security in the gangue discharge process.In order to solve the problem,it is proposed to build a dynamic screen gangue reseparation system to recover the coal taken away by the gangue discharge in order to increase the economic benefits of enterprises.