Bonded neodymium iron boron is a bonded magnet with the highest magnetic properties. The magnetizing direction of the magnet can be arbitrarily selected, and the radial multipole magnetizing of the ring magnet can be made. The complex magnet shape can be made, and the magnetic powder can be coated with heat-resistant plastic and additives, so that it has excellent thermal stability, and the special resin coating can ensure its good corrosion resistance.