Shock absorber based on multiple protection

A shock absorber based on multiple protection comprises an inner cylinder, an outer cylinder, an oil filtering tank, an automatic adjusting mechanism, a manual adjusting mechanism, a buffering device and a sealing device. An oil storage barrel is coaxially arranged in the outer barrel, an inner oil cavity is formed in the oil storage barrel, and an outer oil cavity is jointly formed in the space between the outer wall of the oil storage barrel and the inner wall of the outer barrel; a piston is fixedly mounted in the inner cylinder and is mounted in the oil storage barrel in a sliding manner; the inner cylinder sleeves the oil storage barrel and is slidably mounted in the outer oil cavity; a buffer device is arranged at the bottom end in the oil storage barrel; the oil filtering tank is fixedly mounted on the outer wall of the outer cylinder; the automatic adjusting mechanism and the manual adjusting mechanism are arranged in the oil filtering tank; according to the shock absorber, the oil way communication a