The invention relates to a wheel-side deceleration driving device of an equal-length double wishbone suspension, which belongs to the field of electric vehicles and comprises a double wishbone suspension, a motor, a synchronous belt, a small belt pulley, a big belt pulley, a small bevel gear, a big bevel gear, an axle housing, a transmission half shaft, a hub supporting member, wheels and the like, wherein one end of an upper cross arm is hinged with a vehicle frame through a rotating pair, the other end of the upper cross arm is hinged with the upper end of the axle housing on an A point through the rotating pair, one end of a lower cross arm is hinged with the vehicle frame through the rotating pair, and the other end of the lower cross arm is hinged with the lower end of the axle housing on a D point through the rotating pair. The B and the C respectively are middle points of a connecting line between hinged points of the upper cross arm, the lower cross arm and the vehicle frame, and the A, the B, the C and the D form a parallelogram. The motor is arranged on a middle point of the B and the C, the small belt pulley is arranged on an E point, the big belt pulley is arranged on an F point, the length between the E and the F stays the same during jumping process of the wheels, and the distance between the two belt pulleys does not change, thereby guaranteeing power to be steadily transported. The motor is fixed on the vehicle frame, thereby increasing select range of motor power, reducing unsprung mass of electric wheels, and effectively increasing controllability and harshness of a finished vehicle.