The invention relates to a permanent magnet motor, which comprises a stator and a rotor arranged in the stator, wherein the stator comprises a shell and a magnetic steel arranged on the inner side of the shell, the shell comprises n side plates (23a to 23d) and n connecting parts (25a to 25d), n is an integer of more than 3, each connecting part is connected with the two adjacent side plates, and the inside surface of the connecting part is provided with the magnetic steel; the radial section of each side plate is of a curve, and the curve protrudes outwards relative to straight lines passing through two ends of the curve; and the shell also comprises an end cover (21), and the end cover comprises a bottom (33) and n side walls (34) extended along the axial direction from the bottom, wherein the outside surface of one side wall comprises a mounting plane (35). The permanent magnet motor has compact structure and high power density, and is convenient to install and fix.