The new energy automobile industry is one of the most widely used industries of mixed rare earth metals. Mixed rare earth metals play an important role in new energy vehicles, which are mainly used to manufacture permanent magnet motors and battery materials. Permanent magnet motor is the core power device of new energy vehicles, and the permanent magnet materials used contain a lot of rare earth elements, such as neodymium, praseodymium and samarium. These rare earth elements endow permanent magnetic materials with high magnetic energy product and good magnetic properties, and make the motor have the characteristics of high efficiency, light weight and high performance. Mixed rare earth metals are also widely used as battery materials for new energy vehicles to improve the energy density and cycle life of batteries.