Low-noise leak-free circulating pump

The utility model relates to a low-noise leak-free circulating pump, which belongs to the manufacturing field of the circulating pump. The circulating pump comprises a water pump part and a motor part, wherein the water pump part mainly consists of a pump body, a sealing rubber pad and an impeller; and the motor part mainly consists of a stator assembly, a rotor assembly, a stator separation sleeve module, a discharge screw plug and a seat. The water pump is integrated with the motor, so a cooling blade and mechanical sealing structure is cancelled; and a graphite bearing and a ceramic rotating shaft are adopted, and pumped medium between the stator assembly and the rotator assembly circularly cools and naturally lubricates the motor. A stator separation sleeve on the stator separation sleeve module is welded together with a bearing seat, and the graphite bearing is assembled on the bearing seat. A rotor separation sleeve wraps the outer diameter of a rotor on the rotor assembly, and a rotating shaft of the rotor assembly is provided with a through hole along the axis.