The invention discloses a novel quadrilateral linear motor, which comprises a cylindrical bracket and four asymmetric bilateral permanent magnet linear motors mounted on the bracket, wherein the fourasymmetric bilateral permanent magnet linear motors are distributed along the circumference of the bracket in space and are spaced apart from each other at 90 degrees. The four motors are combined inthe space to form a cylindrical structure, and the thrust fluctuation is reduced through a method of shifting the long secondary magnet blocks of each motor by a fixed angle. According to the novel quadrilateral linear motor, the armature and the magnetic pole are used as the short primary side, so as to realize the advantages of the magnetic flux switching structure, and also to effectively avoidthe disadvantages of difficult heat dissipation of the magnetic pole and mutual competition between the magnetic path and the circuit; and the novel quadrilateral linear motor not only greatly reduces the amount of the permanent magnet, improves the magnetic field adjustment capability, but also reduces the system cost.