The invention discloses a deflection mechanism of a reverse tricycle. The deflection mechanism comprises a front steering support, a front left wheel, a front right wheel, a left supporting beam, a right supporting beam, a left deflection part and a right deflection part; the left deflection part comprises a left piston body and a left piston rod matched with the left piston body, the right deflection part comprises a right piston body and a right piston rod matched with the right piston body, a middle piston body and a middle piston fitted in the middle piston body are arranged on the lower middle portion of the front steering support, wherein the inner cavities of the left piston body and the right piston body are divided into upper and lower portions by the left piston rod and the rightpiston rod correspondingly, the upper portion of the inner cavity of the left piston body and the upper portion of the inner cavity of the right piston body are communicated with the upper portion ofthe inner cavity of the middle piston body through oil pipes, switching-on and switching-off are controlled by a solenoid valve, the lower portion of the inner cavity of the left piston body and thelower portion of the inner cavity of the right piston body are low-pressure cavities, and the lower portion of the inner cavity of the middle piston body is a high-pressure cavity. According to the deflection mechanism of the reverse tricycle, control is flexible, self-adaptive adjustment can be conducted based on actual conditions of parking, pit passing, bending, deflection at a small angle andthe like, the deflection mechanism has the functions of buffering and vibration damping, deflection and deflection locking, automatic alignment of deflection at a small angle and the like, and the deflection mechanism is stable and reliable.