Heat treatment equipment and diffusion method of neodymium-iron-boron magnet

The invention discloses heat treatment equipment and a diffusion method of a neodymium-iron-boron magnet.The heat treatment equipment comprises a rotatable furnace body and a lifting part; the furnace body comprises a heating chamber and a low-temperature chamber; the heating chamber and the low-temperature chamber are separated by an intercepting net; the mesh size of the intercepting net is smaller than that of the neodymium-iron-boron magnet; and the lifting part is arranged at one end of the furnace body, and the heating chamber is lifted through the lifting part, so that other materials, except the magnet, in the heating chamber enter the low-temperature chamber. The diffusion method based on the heat treatment equipment can be used for grain boundary diffusion of small-size magnets and special-shaped magnets, the diffusion efficiency is high, adhesion between the magnets and a diffusion source is reduced, consumption of the diffusion source is reduced, collision between the magnets is reduced, and unfil