The market prospect and important position of samarium cobalt permanent magnet are very important to modern times, so the surface protection technology of samarium cobalt permanent magnet is regarded as an important technical secret by foreign manufacturers. In ORDER TO IMPROVE THE competitiveness OF products, occupy the international market and give FULL play to the advantages of rare EARTH's resources, it is necessary to develop our unique magnet protection technology with intellectual property rights. China has always been a major rare earth resource country in the world, with industrial reserves of 4,800 tons and prospective reserves of 120 million tons. Rare earth permanent magnets represented by samarium cobalt permanent magnets are one of the most important functional materials at present, and their production and consumption have become one of the important indicators to measure a country's comprehensive strength and national economic development level.