NdFeB permanent magnet is a kind of NdFeB magnetic material. It is also called the latest result of the development of rare earth permanent magnet materials. It is called the "Magnet King" due to its excellent magnetic properties. This is a product developed by the national 863 high-tech program. NdFeB permanent magnets have extremely high magnetic energy product and coercive force. At the same time, the advantages of high energy density make NdFeB permanent magnet materials widely used in modern industry, electronic technology and medical industry, thus making instrumentation, electronics It becomes possible to make acoustic motors, magnetic separation and magnetization, medical devices, medical equipment and other equipment smaller, lighter and thinner. The advantages of NdFeB permanent magnets are high cost performance and good mechanical properties; the disadvantages are low Curie temperature point, poor temperature characteristics, and easy to pulverize and corrode. It must be adjusted by adjusting its chemical composition and adopting surface treatment methods. Only by improving it can it meet the requirements of practical applications.