The invention discloses a left-right movable sand screening device with a damping function. The device comprises a base and a box body, wherein a sliding seat is slidably arranged on the upper side ofthe base; the bottom of the box body is fixedly arranged on the sliding seat through a support; a second screening plate is fixedly arrange inside the box body; the inside of the box body is dividedby the second screening plate into an upper cavity and a lower cavity; two rotating shafts are rotatably arranged inside the upper cavity and the lower cavity correspondingly; a plurality of stirringrods are fixedly arranged on the rotating shafts; a rotating disc is rotatably arranged on a position, at the right side of the sliding seat, of the base; two connecting rods are rotatably arranged atthe eccentric positions of the front side and the rear side of the rotating disc; and the other end of each connecting rod is rotatably connected with the right side of the sliding seat. According tothe device, the two hollow rotating shafts are rotatably arranged to drive the stirring rods to rotate, so that the sand is scattered and screened, and the screening effect is improved; and a hot airblower is arranged to dry the sand so as to prevent the sand from caking, and the screening effect is further improved.