Rear shock absorber of motorcycle

The motorcycle rear shock absorber comprises an oil storage cylinder, an outer spring and an upper connector, a piston rod is installed in the oil storage cylinder, a lower valve seat, an upper valve seat and a buffer spring are sequentially installed on the outer side of the lower portion of the piston rod from bottom to top, and a piston is installed on the outer diameter of the lower valve seat and the outer diameter of the upper valve seat; the piston is inserted into the inner side of the oil storage cylinder, a composite bush is installed on the outer diameter of the piston, the top and the bottom of the piston are each provided with a valve block set and an abutting flat gasket, and a first flat gasket, an oil seal sealing ring and a second flat gasket are sequentially installed in an inner hole in the top of the oil storage cylinder from bottom to top. The bottom end of the buffer spring abuts against the top of the upper valve seat, and the top end of the buffer spring abuts against the bottom of the