永磁体R_x(Fe_(1-z)Coz)_(100-x-y-w)B_yM_w(R为钇或稀土,x=5～20,y=4～15,z=0～0.7,w=4～10,M是从Zr、Nb、Mo、Hf、Ta、W、TiCr和V中选择的一种元素)的生产方法包括:向一旋转的冷态基体的沟槽表面上连续输送一种熔融硼基合金(B);向浇注在旋转的冷态基体表面的基体合金层(B)上连续输送一种熔融合金(A); The permanent magnet R_x (Fe_ (1-z) Coz) _ (100-xyw) B_yM_w (R is yttrium or rare earth, x = 5-20, y = 4-15, z = 0-0.7, w = 4-10, M is an element selected from the group consisting of Zr, Nb, Mo, Hf, Ta, W, TiCr and V) comprises continuously feeding a molten boron-based alloy onto the grooved surface of a rotating cold substrate (B); continuously feeding a molten alloy (A) onto the base alloy layer (B) cast on the surface of the rotating cold base;