The utility model relates to an improved buffer which comprises a centre rod, a piston, a cylinder sleeve and an air exhaust noise elimination intercepting valve. The buffer is characterized in that an air inlet/outlet is arranged on the outer wall at the bottom of a cavity of the air exhaust noise elimination intercepting valve, and sound absorbing sponge is arranged on the outer side of the cavity. The buffer has the benefits that the sound absorbing effect is good during the buffering process of the buffer; and water accumulation is not easy to occur in the cavity, so that the maintenance cost of the buffer is reduced, and the service life of the buffer is increased.