The invention discloses a method for implanting tungsten carbide in a specific area of a mould. The method comprises the following steps: A. preparation of a prefabricated resin mould with uniformly distributed tungsten carbide; B. preparation of an integral evanescent mould with a specific area containing uniformly distributed tungsten carbide; C. preparation of a sand box: placing the evanescent mould into a steel box, carefully adding moulding sand into the steel box around the evanescent mould, and covering a layer of ethylene-vinyl acetate copolymer film which is 4-6mm thick on the upper surface of the steel box to ensure the airtightness of the sand box; D. mould casting and moulding: pouring molten metal into a mould cavity of the evanescent mould, wherein when mould resin is replaced with the molten metal and tungsten carbide particles are captured, the tungsten carbide particles are completely replaced without changing the original positions of the tungsten carbide particles in the mould resin, so as to obtain alloy casting having a specific area with enhanced performance. According to the method disclosed by the invention, a casting technology of the evanescent mould is improved to a certain degree, the tungsten carbide particles are dispersed in a specific part of the mould, especially the tungsten carbide particles are uniformly dispersed in the specific part, so that the alloy casting with excellent properties is prepared under the condition of low cost.