Blood pumping device

Disclosed is a blood pumping device, comprising: a housing (10) having an overflow passage (11), and an inlet (12) and an outlet (13) respectively connected to the overflow passage (11); a rotor assembly (20) rotatably arranged in the overflow passage (11); a coil (30) arranged in a side wall of the housing (10); a first permanent magnet part (42) arranged inside the rotor assembly (20); a second permanent magnet part (44) arranged in the side wall of the housing (10), with the first permanent magnet part (42) and the second permanent magnet part (44) forming a radial permanent magnetic bearing; a piece of electric motor magnetic steel (40) arranged inside a rotor of the rotor assembly (20); and a magnetic protection part (31) arranged at the periphery of the coil (30), wherein the magnetic protection part (31) and the piece of electric motor magnetic steel (40) act together to provide an axial pre-tightening force for the rotor assembly (20). The blood pumping device provides a radial support force for the rotor assembly (20) by using the radial permanent magnetic bearing, and provides the axial pre-tightening force for the rotor assembly (20) by means of the combined action of the magnetic protection part (31) and the piece of electric motor magnetic steel (40) so as to support the rotor assembly (20) in the axial direction.