The drum screen is the new generation of screen material equipment. Drum screening machine main motor, reducer, roller device, rack, closures, and out of discharge port. Whole and ground plane into a tilted state, the external seal sealed isolation cover, to prevent pollution of the environment. Screening drum rotation speed, variable speed reducer system materials from top to bottom have been isolated by screening tube, fine material discharged from screening the bottom of the tube front-end, the crude material from the bottom of the sieve tube from the rear.