The invention discloses a slotless motor for an implantable axial flow blood pump. The slotless motor comprises a stator iron core, a stator winding, a rotor rotating shaft and a rotor permanent magnet. The slotless motor is characterized in that the stator iron core is formed by axially punching a circular silicon steel sheet, the rotor permanent magnet is made of a permanent magnetic material and is supportive of radial magnetizing, a coil of the stator winding is positioned between the stator iron core and the rotor rotating shaft, the stator winding is pasted on the inner wall of the stator iron core which is cylindrical, and the stator iron core is of a tooth-slotless structure. A direct-current brushless slotless structure is adopted, so that tooth-slot torque is eliminated, and copper loss is lowered. A triphase winding is divided into two layers of structures, copper wires at the end are arranged regularly, and thickness is consistent with that of a central portion, so that radial thickness of the end of the motor is reduced. High-heat-conductivity epoxy resin is used to fix the stator winding, so that the problem that the coil generates heat is solved effectively, the motor winding is fixed, and electromagnetic vibration and noise are avoided.