Broken stone sieving and crushing device

The invention discloses a broken stone sieving and crushing device which includes a box body. The upper end of the box body is provided with a feeding barrel, broken stone enters the box body throughthe feeding barrel, the lower end of the box body is provided with a discharging port, the broken stone which is crushed is collected and packaged through the discharging port, a sieving plate is arranged in the box body, a first motor is fixedly connected to the top end of the interior of the box body, the output end of the first motor is fixedly connected with a lead screw, the lead screw is provided with grinding stone, a first through hole is formed in the middle of the grinding stone, a thread is arranged in the first through hole, the lead screw is in threaded connection with the first through hole, the grinding stone is provided with a plurality of second through holes, limit rods are slidably arranged in the second through holes, the top ends of the limit rods are fixedly connectedto the inner top wall of