Hydrogen circulating pump of oil-free high-efficiency proton exchange membrane fuel cell

The utility model relates to an oil-free high-efficiency proton exchange membrane fuel cell hydrogen circulating pump which comprises a motor, a pressing shell, a shaft, a pressing wheel, a motor baffle turned edge facing the motor, a spacer sleeve embedded in the inner wall of a motor shell pressed by the motor turned edge and an O-shaped sealing ring, the motor is an axial magnetic flux motor, and the axial magnetic flux motor is axially arranged corresponding to the shaft. A bearing inner ring is sleeved on the shaft in a clearance manner, the bearing inner ring is sleeved in a magnet sheath in an interference manner, one end of the magnet sheath is provided with a magnet corresponding to a stator coil of the axial magnetic flux motor towards the motor baffle, and the other end of the magnet sheath is provided with a back plate; a pressing wheel is clamped between the back plate and the magnet sheath, and the back plate, the pressing wheel and the magnet sheath are sequentially connected in a penetrating m