Sand screening device with good damping effect

The sand screening device with the good damping effect comprises a working bin, a screening plate, a supporting plate and a connecting rod, the screening plate is movably connected to the middle of the interior of the working bin, the supporting plate is fixedly connected to the bottom end of the interior of the working bin, and a hollow cylinder is fixedly connected to the top end of the supporting plate; and a sliding groove is formed in the hollow cylinder, a connecting rod is movably connected to the interior of the top end of the hollow cylinder, and a sieve plate is fixedly connected to the top end of the connecting rod. Force generated by vibration of sieved materials of the sieve plate can be transmitted to a second limiting block below through a connecting rod, meanwhile, the second limiting block can push a sliding rod to move in a sliding groove, meanwhile, the second limiting block can extrude a second spring, and due to the counter-acting force generated when the second spring is extruded, the se