One kind of a method for producing a sintered NdFeB magnet and

A sintered NdFeB magnet, the main component includes rare earth element R, the element T is added, iron Fe and boron B, have rich phase and a main phase having a Nd2Fe14B crystalline structure, wherein: said maximum energy product of the magnet (BH) max, MGOe units, and the intrinsic coercive force Hcj, the unit kOe sum value is not less than 70, i.e. (BH) max (MGOe) + Hcj (kOe) ≥70. This method for producing a sintered NdFeB magnet comprising melting an alloy, milling, powder mixing, compression type, sintering and heat treatment step. The present invention, by controlling the ingredients of the formulation and the optimum conditions, the degree of orientation of the main phase to maintain an appropriate ratio of main phase crystal grains and higher magnet in the magnet, and optimizing the boundary rich phase microstructure, such that at the same time SINTERED having a high maximum energy product and high intrinsic coercive force, so as to obtain (BH) max (MGOe) + Hcj (kOe) ultra-high performance NdFeB sintered magnet of ≥70.