Abstract: As the 3-G rare earth permanent magnet material, Nd-Fe-B has a wide range of applications. Based on patent analysis, the development status of Nd-Fe-B is investigated from several aspects, including development status, manufacturing technique, grain boundary modification, technical effect, regional competition status, patent quality and patent applicants, to provide intelligence support for related government agencies, enterprises and research institutes in the further development of Nd-Fe-B industry and technologies. Research results indicate that Nd-Fe-B technologies are booming, with a sign of reaching mature stage. Patent applicants from Japanese and US have built formidable patent barriers in this field. China has shown great R & D enthusiasm towards Nd-Fe-B-related technologies in recent years and has applied a large number of relevant patents. However, in terms of patent quality, China still has a long way to go in the technological level in Nd-Fe-B. Finally, based on the conclusions of the patent analysis, strategic measures for the technological innovation and development of Nd-Fe-B are proposed.