The invention discloses a cooling structure of a rotary motor. The cooling structure comprises a sleeve and a plurality of main shunting walls, wherein the sleeve is provided with a circumferential surface, and the circumferential surface comprises a first semi-circumferential surface and a second semi-circumferential surface. The main shunting walls are arranged on the circumferential surface ofthe sleeve in parallel to form a plurality of main flow channels. Each main shunting wall comprises a main notch, wherein the two main notches of every two adjacent main shunting walls are arranged onthe first semi-ring circumferential surface and the second semi-ring circumferential surface respectively. By means of the main notches of the main shunting walls arranged on the circumferential surface in a staggered manner, a cooling medium is provided to flow in a staggered manner, so that the heat dissipation efficiency of the rotating motor is improved.