The invention provides a method for preparing a grinding disc with boron carbide and belongs to the field of grinding tool preparation. The preparation method comprises the steps that (1) the high-quality boron carbide serves as a grinding material, the boron carbide and resin binders are subjected to hot-press molding, the boron carbide and ceramic binders are subjected to high-temperature sintering, and the boron carbide and metal binders are electroplated or sintered, so that a boron carbide grinding layer is obtained; and (2) the grinding material layer and a matrix are combined through binders or electroplating, and the boron carbide grinding disc is obtained. By the adoption of the method, the phenomena of roughness, chipping, cracking and the like, caused by excessively-high hardness of diamond, of workpieces can be reduced, the flatness of the grinding surface is improved, the qualification rate of the workpieces is increased, and the difficulty and intensity of the subsequent polishing procedure are lowered; and the cost of the grinding disc is greatly reduced, and the economical benefits of the grinding disc are remarkably improved.