Double-rocker-arm rear axle assembly of tricycle

A double-rocker-arm rear axle assembly of a tricycle comprises a frame and two sets of double-rocker-arm structures arranged on the two sides of the frame respectively, each double-rocker-arm structure comprises a lower swing arm, an upper swing arm, a steering knuckle and a shock absorber, the lower swing arms and the upper swing arms are hinged to the frame, the steering knuckles are connected between the outer sides of the lower swing arms and the outer sides of the upper swing arms, and the shock absorbers are arranged on the frame and transversely arranged. The outer end of the shock absorber is hinged to the upper swing arm, an adjusting mechanism which is connected with the inner end of the shock absorber and used for adjusting the distance between the inner end of the shock absorber and the upper swing arm so as to adjust the height of a vehicle chassis is arranged on the vehicle frame, the adjusting mechanism comprises a first installation base arranged on the vehicle frame, and an adjusting hole is