The invention belongs to the technical field of secondary resource utilization, and relates to a method for preparing high-quality silicon carbide through a diamond wire cutting waste material. The method solves the treatment problem of the diamond wire cutting waste material, and is characterized by comprising the steps of directly compounding a carbonaceous reducing agent, a catalyst agent and abonding agent into the cutting waste material according to the weight ratio, uniformly mixing, pressing into pellets, drying the pressed pellets, putting in a high-temperature reaction furnace for reacting, preparing into silicon carbide crystalloid blocks, finally crushing, acid pickling and drying the silicon carbide crystalloid blocks to obtain the high-quality silicon carbide powder. According to the method for preparing the high-quality silicon carbide through the diamond wire cutting waste material provided by the invention, not only is the utilization rate of the diamond wire cutting waste material high, the production cost is low, the energy consumption is less, and the produced silicon carbide has high purity and good quality. The method has a higher commercial value.