The main structure of the hydraulic buffer is composed of body, axis, bearings, inner tube, piston, hydraulic shaft, spring, etc. When the axis is impacted by an external force, it will drive the piston to squeeze the hydraulic oil in the inner tube. After the hydraulic oil is pressed, it will The oil drain holes of the inner tube are discharged one by one, and at the same time, the hydraulic oil discharged from the inner tube also flows back to the inner tube through the oil return hole of the inner tube;when the external force disappears, the spring rebounds the piston back to the starting point to wait for the next action. Based on this principle, the hydraulic buffer will be able to balance and effectively stop moving objects.