The invention discloses a method for preparing glass-ceramic by using carbide slag, and belongs to the field of resource utilization of carbide slag. The method comprises: pre-treating carbide slag at a high temperature, mixing with an auxiliary material, melting at a high temperature, and carrying out base glass annealing, microcrystalline treatment and other processes to prepare the high added value glass-ceramic. According to the present invention, the prepared glass-ceramic has characteristics of high utilization value, simple process and the like, the raw material is the solid waste produced in the industrial production process, the produced glass-ceramic can be widely used in the building materials and other industries, and the harmless and resource utilization of the carbide slag is achieved.