The invention discloses a combination low-cogging force permanent-magnet linear motor and an implementation method thereof. The linear motor comprises a primary and a secondary, wherein the primary comprises a primary iron core and an armature winding, the armature winding is wound around primary iron core teeth, the secondary is formed by tightly assembling at least one group of master secondarymodule and slave secondary module, a single secondary module comprises a permanent magnet and a secondary yoke plate, the numbers of permanent-magnet poles in the single secondary module are same, andthe widths of permanent-magnet poles in each secondary module are different. Cogging forces of the master secondary module and the slave secondary module are positive values at a front half period and are negative values at a rear half period, a cogging force of the slave secondary module is a negative value at the front half period and positive value at the rear half period, the cogging force generated by the master secondary module and the cogging force generated by the slave secondary module are highly complementary in waveform, and the master secondary module and the matched slave secondary module are combined in a block way along a secondary moving direction. The linear motor has the beneficial effects that the total cogging force of the combined motor can be remarkably reduced, andthe utilization rate of the magnet is not reduced.