The invention provides a method for enhancing magnet performance through a reducing-dispersing method. The method comprises the following steps of: dissolving rare earth chloride into aqueous solution to obtain rare earth hydrate sol solution; preparing a sintered NdFeB magnetic block, preparing into a sintered NdFeB magnet of a required size, and performing processes such as acid cleaning, cleaning and the like; soaking into the rare earth hydrate sol solution, and performing ultrasonic treatment simultaneously to form a layer of rare earth hydrate sol on the surface of the magnet; taking out, drying to remove a solvent; putting the dried sintered NdFeB magnet, from which the solvent is removed, and metal Ca particles into a sintered rare earth magnet treating device, putting into a vacuum sintering furnace, vacuumizing the vacuum sintering furnace, heating and preserving heat; charging Ar gas into the vacuum sintering furnace, and cooling; and performing aging treatment, charging Ar gas, cooling and discharging. In the magnet prepared by using the method, heavy rare earth elements are introduced to increase Hcj; and meanwhile, the content of the heavy rare earth elements in main phase particles is lower, so that high Br can be kept.