This technology has the characteristics of fast nitriding speed, controllable organization structure, applicable to various materials, small deformation, easy to achieve local nitriding and uniform nitriding, etc. Meanwhile, the labour conditions are good and the pollution to the environment is light. The basic principle of ion nitriding equipment is to use high-energy nitrogen ions to bombard the surface of the workpiece, through the kinetic energy converted into thermal energy to heat the workpiece, while the nitrogen ions absorb the electrons into atoms to be absorbed by the surface of the workpiece and diffuse to the inner layer. In addition, ion bombardment of the surface of the workpiece will also produce cathodic sputtering, sputtering out of the iron ions and nitrogen ions to form iron nitride, FeN re-attachment to the surface of the workpiece, and then decomposed into Fe2N and Fe3N and release nitrogen atoms to the workpiece diffusion.