Particle size screening device

The utility model discloses a particle size screening device which comprises a screening box body, a screening plate and a vibrating plate are installed in the screening box body in a sliding mode, the vibrating plate is located below the screening plate, a plurality of screening holes are evenly distributed in the screening plate, a sliding block is installed on one side of the screening plate in a sliding mode, and a plurality of cleaning blocks are evenly installed at the bottom of the sliding block. The screening plate is provided with a plurality of screening holes, the screening plate is provided with a cleaning block, the cleaning block corresponds to the screening holes, the cleaning block is arranged on the screening holes in a sliding mode, one end of the sliding block is fixedly provided with a shifting block, one end of the shifting block extends out of the screening plate, and the shifting block is connected with the screening plate in a sliding mode. And the motor drives the cam to do circular m