Gravity type seed cleaner

The utility model discloses a gravity type seed cleaner; and the gravity type seed cleaner comprises a frame (19), a material inlet (9), a material outlet (1), an impurity outlet (12), a vibrating screen (3) and a vibrating screen driving device (16) and is characterized in that a cover plate (7) is arranged at the upper part of the vibrating screen (3); the cover plate (7) at least covers one part from the impurity outlet (12) to the middle part of the vibrating screen (3); meanwhile, a negative pressure air suction opening (10) is formed in a space formed between the cover plate (7) at one end of the impurity outlet (12) and the vibrating screen (3). Compared with the prior art, the gravity type seed cleaner disclosed by the utility model is suitable for cleaning various grains or seeds, is especially suitable for large-sized seed washing equipment and has the advantages of strong machining capacity and good washing effect.