Sintered NdFeB prepared from NdFeB waste and preparation method of sintered NdFeB

The invention provides sintered neodymium-iron-boron (NdFeB) prepared from neodymium-iron-boron waste and a preparation method of the sintered neodymium-iron-boron. Aiming at the conditions that rare earth resources are in shortage at present, neodymium iron boron demands are increased, and an existing neodymium iron boron recovery technology is high in cost, is easy to cause pollution and the like, grain boundary modification is carried out on the neodymium iron boron waste through LSPN mixed rare earth powder, the direct utilization ratio of the neodymium iron boron waste is increased, the effective utilization rate of the neodymium iron boron waste is increased, and the pollution to the environment in the waste separation, purification and reutilization process is reduced. And meanwhile, the neodymium iron boron waste is classified, a specific standard is formulated, the waste is subjected to grading treatment, and the batch and efficient treatment of the neodymium iron boron waste is facilitated. 本发明提供一种利