The invention discloses a method for preparing high coercivity NdFeB magnets containing less heavy rare earth. The method comprises following steps: batching, melting and rapid hardening casting strips; by means of the physical vapor deposition method, heavy rare earth particles or high-melting particles are deposited on NdFeB thin sheets under inert atmosphere; performing crushing and pulverizing, orientating and shaping, sintering and heat treatment to obtain NdFeB magnets. By means of the method, the coercive force of NdFeB magnets can be substantially increased, the magnet crystal grains are refined and the usage amount of heavy rare earth elements is greatly reduced.