The invention provides a circular-distributed cylinder type linear actuator at each phase. The cylinder type linear actuator comprises a rotor, a stator, an armature winding and an axial bearing, wherein the rotor comprises a rotor iron core and a three-phase armature winding; the rotor iron core is cylindrical, rotor magnetic poles are arranged at the periphery of the rotor iron core, and armature windings are twined on the rotor magnetic poles; all rotor magnetic poles of the same phase are aligned in a peripheral direction, and the rotor magnetic poles of the same phase are uniformly distributed in an axial direction and the axial distance is a polar distance; three-phase rotor magnetic poles are uniformly distributed in a peripheral direction; a B-phase rotor magnetic pole exceeds an A-phase stator magnetic pole by one third of a polar distance in an axial direction. According to the circular-distributed cylinder type linear actuator at each phase provided by the invention, the windings of various phases are distributed along the circumference, therefore, a phenomenon that each phase is asymmetric due to an end effect of a traditional linear motor does not exist, and a loop formed by each flux linkage is directly formed by two adjacent poles, therefore, the magnetic potential of the iron core is reduced and the total magnetic resistance loss is small.