Abstract: In order to improve the magnetic properties of permanent magnetic films and increase the utilization of Ce elements, the magnetization reversal process of the dual main phase Nd2Fe14B/Ce2Fe14B periodic multilayer film has been simulated, and the influence of the thickness of the magnetic layer and the number of layers of the multilayer film on the magnetic properties of the periodic multilayer film during the magnetization reversal process has been systematically studied. The remanence, coercivity, hysteresis loop of the system and the energy change during the magnetization reversal process and the magnet are analyzed. The coercive force mechanism will provid a certain reference for the preparation of high-performance magnets with high Ce content in the future. The research results show that when the thickness of the fixed multilayer film is constant and the number of the fixed multilayer film is constant, with the increase of the thickness of the magnetic layer, the coercive force and maximum magnetic energy product of the system gradually decrease; The coercive force mechanism is mainly dominated by nucleation; when other conditions are the same, the coercivity and magnetic energy product of the parallel-oriented periodic multilayer film are better than those of the perpendicularly-oriented periodic multilayer film; the total thickness of the periodic multilayer film increases Will reduce the influence of orientation on coercivity. The research results will help to deepen understand the magnetization reversal mechanism of the dual-phase Nd-Fe-B/Ce-Fe-B magnets, and provide a certain reference for optimizing the magnetic properties of permanent magnet films in future experiments.