Efficient seed screening box

The efficient seed screening box comprises a screening box body, screening assemblies are arranged on the left side and the right side of an inner cavity of the screening box body correspondingly, each screening assembly comprises a second spring, a guide rod, a mounting plate, a guide groove and a guide block, and the mounting plates are fixedly mounted on the left side and the right side of the screening box body correspondingly; and guide grooves are formed in one sides of the two mounting plates. A screening assembly is arranged, a power motor is started, when two cams make contact with the bottom of a screening box, the screening box is pushed upwards, a guide block slides on a guide rod, the screening box is driven to move downwards through elastic force of a second spring, screening holes of a screen are prevented from being blocked, and the filtering effect of the screen is conveniently improved; by arranging the mounting assembly, two pull plates are pulled, two pull rods drive limiting plates to mov