Neodymium magnet, also known as NdFeB magnet, is an alloy formed by neodymium, iron and boron (Nd2Fe14B). Rare earth is used as the raw material for the production of NdFeB permanent magnet materials, and the raw materials always account for more than 70% of the production cost of NdFeB processing enterprises. In the application field, Nd-Fe-B permanent magnet materials are widely used in energy-saving air conditioning, energy-saving elevator, consumer electronics, wind power, Automotive EPS, new energy vehicles and other fields. In recent years, the NdFeB recycling industry, as a part of the recycling economy of renewable resources, has been in the rising stage. Especially with the implementation of the mandatory production plan, the production of rare earth raw ore separation enterprises has been limited, the development of NdFeB waste recycling industry has risen explosively, and the medium rare Tianma came into being.