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This invention provides a method for preparing silicon carbide using waste granite powder and conductive carbon black, comprising the following steps: S1, mixing waste granite powder and conductive carbon black evenly to form a mixture; S2, ball milling the mixture and sieving it to obtain a refined mixture; S3, placing the refined mixture into a Joule apparatus and sintering it to prepare a multiphase composite powder; S4, calcining the multiphase composite powder at high temperature and then alkali washing to obtain silicon carbide powder. This invention achieves high-value recycling of waste granite powder, solving the problems of high energy consumption and long cycle time in traditional silicon carbide preparation processes, and avoiding the problems of large land occupation and significant pollution from the accumulation of building material waste. This invention aligns with the concept of green and low-carbon development, turning waste into treasure. By designing different raw material ratios and sintering parameters, different types of silicon carbide products can be prepared, creating economic benefits while controlling pollution.