A coupling for axle-suspended installation of a direct drive motor, comprising a wheel axle side adapting flange coaxially fixed with a wheel axle and a motor side adapting flange coaxially fixed with the rotor shaft of a motor, wherein comprising an elastic support rotating assembly, the elastic support rotating assembly is radially connected between the wheel axle side adapting flange and the motor side adapting flange so that the wheel axle side adapting flange and the motor side adapting flange can be coaxially and rotatably connected and bear the weight of the motor along the radial direction through the elastic support rotating assembly, and the wheel axle side adapting flange and the motor side adapting flange are circumferentially elastically connected, wherein the wheel axle side adapting flange comprises a wheel axle sleeve sleeved on the wheel axle by interference fit, connecting blocks I used for circumferential elastic connection with the motor side adapting flange, and a radial connecting ring, wherein the connecting blocks I are uniformly distributed along a periphery of the wheel axle sleeve and connected with the wheel axle sleeve through the radial connecting ring, wherein the motor side adapting flange comprises a connecting cylinder coaxially and fixedly connected with the rotor shaft of the motor and connecting blocks II used for circumferential elastic connection with the wheel axle side adapting flange, wherein the connecting blocks II are fixed on a periphery of the connecting cylinder and uniformly distributed on the periphery of the connecting cylinder in one-to-one correspondence to the connecting blocks I, and the connecting blocks II and the corresponding connecting blocks I are circumferentially separated and elastically connected, wherein the connecting cylinder is sleeved with a radial support locating cylinder, the connecting blocks II are arranged on the peripheral surface of the radial support cylinder and integrated with the radial support cylinder, the axial height of the radial support locating cylinder is greater than that of the connecting cylinder, and an elastic support rotating assembly is coaxially installed in an inner cavity of the radial support locating cylinder and sleeved on the wheel axle sleeve, characterized in that the elastic support rotating assembly comprises an elastic support cylinder installed in the inner cavity of the radial support locating cylinder by circumferential location fit, a bearing pedestal installed in an inner cavity of the elastic support cylinder by circumferential location fit and a bearing compressed in the bearing pedestal, wherein the inner ring of the bearing is sleeved on the wheel axle sleeve. wherein the wheel axle side adapting flange comprises a wheel axle sleeve sleeved on the wheel axle by interference fit, connecting blocks I used for circumferential elastic connection with the motor side adapting flange, and a radial connecting ring, wherein the connecting blocks I are uniformly distributed along a periphery of the wheel axle sleeve and connected with the wheel axle sleeve through the radial connecting ring, wherein the motor side adapting flange comprises a connecting cylinder coaxially and fixedly connected with the rotor shaft of the motor and connecting blocks II used for circumferential elastic connection with the wheel axle side adapting flange, wherein the connecting blocks II are fixed on a periphery of the connecting cylinder and uniformly distributed on the periphery of the connecting cylinder in one-to-one correspondence to the connecting blocks I, and the connecting blocks II and the corresponding connecting blocks I are circumferentially separated and elastically connected, wherein the connecting cylinder is sleeved with a radial support locating cylinder, the connecting blocks II are arranged on the peripheral surface of the radial support cylinder and integrated with the radial support cylinder, the axial height of the radial support locating cylinder is greater than that of the connecting cylinder, and an elastic support rotating assembly is coaxially installed in an inner cavity of the radial support locating cylinder and sleeved on the wheel axle sleeve, characterized in that the elastic support rotating assembly comprises an elastic support cylinder installed in the inner cavity of the radial support locating cylinder by circumferential location fit, a bearing pedestal installed in an inner cavity of the elastic support cylinder by circumferential location fit and a bearing compressed in the bearing pedestal, wherein the inner ring of the bearing is sleeved on the wheel axle sleeve.