Motorcycle shock absorber are widely used, and there are many types of vehicles involved in the field of motor vehicles. In terms of rear shock absorbers for motorcycle vehicle accessories, the ideal effect of rear shock absorbers should be progressive: when the wheels pass over small obstacles on the road and are impacted less, the performance of the rear shock absorbers should be relatively gentle and soft to ensure comfortable riding and smooth handling. When the wheels quickly press over large obstacles and are subjected to violent impact, the rear shock absorber should quickly become firm, effectively prevent the motorcycle from touching the bottom, and ensure that the motorcycle can maintain good control. However, the traditional installation method of the rear shock absorber is that the upper end is installed on the frame and the lower end is installed on the rear rocker arm, which is difficult to achieve a progressive effect. Although some motorcycle vehicle accessories manufacturers take measures such as variable rate spring, they cannot change the damping, resulting in excessive elasticity, insufficient damping and other problems.