The rapid-setting process is used to prepare a stripping sheet with a thickness of 0.2-0.3 mm; after hydrogen breaking and jet milling, a powder with a particle size of 2.5-4 microns is obtained; and then the orientation molding and isostatic pressing are used to obtain a uniformly oriented molding press the blank; then the sintered blank magnet is prepared by vacuum sintering and tempering heat treatment; finally, the desired product is obtained by machining and surface treatment.