A damper, including: a tube body, a central spindle, and two laminae. The laminae each include a curved plate, an oil-sealing rib plate and an oil-discharging rib plate which are disposed at two ends of the curved plate, respectively. The inner wall of the tube body is provided with two convex splitters. One end of the central spindle is inserted into an inner chamber of the tube body and sealed in the tube body; the other end of the central spindle extends outside the tube body. The central spindle includes two ribs, and the laminae are disposed between the ribs and the tube body. The ribs, the laminae and the splitters combined divide the inner chamber of the tube body into two pressure chambers and two nonpressure chambers; both the pressure chambers and the nonpressure chambers are filled with damping oil.