Shock absorber

The utility model relates to a shock absorber which mainly comprises a hollow piston connecting rod, a shock absorption spring, a sealing ring, a piston, a buffering ring, an air cylinder, a dustproof sealing ring, a shock absorption head and an air nozzle. An inflating hole is formed in the shock absorption head; an air nozzle connecting hole is in threaded connection with the air nozzle; the air cylinder is in threaded connection with the shock absorption head; the dustproof sealing ring is arranged at the tail end of the air cylinder; the buttering ring is sleeved on the hollow piston connecting rod; threads outside the hollow piston connecting rod are in threaded connection with the piston; the shock absorption spring is arranged in an inner hole of the hollow piston connecting rod; the hollow piston connecting rod is internally arranged in the air cylinder; and the buffering ring avoids the collision and the abrasion among all metal parts. The shock absorption spring plays a shock absorption role; air pr