Screening machine capable of automatically cleaning sticky materials on inner wall and outer wall

The utility model relates to the technical field of drum screening machines, in particular to a screening machine capable of automatically cleaning sticky materials on the inner wall and the outer wall. Comprising a rack and a screening and beating mechanism, the screening mechanism comprises a fine screen drum, a plurality of coarse screen drums and a motor, the motor is fixedly installed at the front end of the rack, a rotating shaft is installed at the output shaft end of the motor, first connecting rib pieces are fixedly installed at the front end and the rear end of the rotating shaft, and the two ends of the fine screen drum are fixedly connected with the first connecting rib pieces; second connecting ribs are fixedly installed on the rotating shaft, the two ends of the coarse screen drum are fixedly connected with the second connecting ribs, a plurality of beating mechanisms are fixedly installed on the fine screen drum, each beating mechanism comprises a support, the supports are tightly hooped on the