The invention discloses a permanent magnet linear synchronous motor. A plurality of rectangular permanent magnets which have the same size and shape and of which the cross sections are provided with four same chamfers form a matrix permanent magnet array on the surface of a magnet yoke; four permanent magnets adjacent to one another form a counter bore; and the permanent magnets are fixed to a secondary bottom plate through fasteners via counter bores. Compared with the prior art, the permanent magnet linear synchronous motor has the advantages of effectively reducing the deformation of a motor structure caused by electromagnetic attraction between primary and secondary and ensuring the normal work of the motor because the permanent magnets are fixed to the secondary bottom plate through the fasteners. Moreover, preferably, the permanent magnet linear synchronous motor is also provided with a cooling device which has the function of reducing the motor temperature and slowing the transfer of the motor temperature to the load through the primary bottom plate.