Sintering preparation method for improving intrinsic coercive force of neodymium-iron-boron magnet

The invention belongs to the field of magnetic materials, and particularly relates to a sintering preparation method for improving intrinsic coercive force of a neodymium-iron-boron magnet. Comprising the following steps: carrying out powder orientation molding on the magnet, packaging with metal foil paper, carrying out vacuum shaping, and carrying out protective heat treatment to obtain the low-oxygen-content magnet. According to the method, the metal foil paper is adopted for packaging and is compacted through isostatic pressing, so that the metal foil paper is tightly attached to the neodymium-iron-boron green body, the metal foil paper participates in the sintering heat treatment process of the neodymium-iron-boron magnet, the grain boundary of the magnet is optimized through component diffusion, and the effects of repairing the grain boundary, improving the crystal structure, improving the intrinsic coercive force of the magnet and the like are achieved; and the neodymium iron boron green body is protec