Dustproof sand screening device for construction site

The utility model discloses a dustproof sand screening device for a construction site. The dustproof sand screening device comprises a feeding hopper, a dustproof cover, a machine body and a base. The feeding hopper is connected with the dustproof cover; a handle is arranged on the dustproof cover and located at the other end, opposite to the feeding hopper, of the dustproof cover, and the dustproof cover can be taken down. The machine body is located below the dustproof cover, four upper spring seats are connected to the two side walls of the machine body, the upper spring seats are connected with damping springs, the lower portions of the damping springs are connected with supporting legs, a force guiding plate is connected to the bottom of the machine body, and a motor seat is connected to the lower portion of the force guiding plate; an upper discharging hopper, a middle discharging hopper and a lower discharging hopper are arranged at the front end of the machine body from top to bottom, open outlets of