The invention belongs to the metallurgic field and particularly relates to a method for continuously smelting carbide slag. The method comprises a heating stage and a reduction stage and particularlycomprises the steps of firstly heating titanium-containing slag until complete fusion, adding the fused titanium-containing slag into a smelting furnace, and carrying out reduction, so as to obtain the carbide slag. According to a process of the method, the extreme cooling and heating of a resistant material of a carbonization electric furnace can be avoided, so that the longevity of the resistantmaterial of the carbonization electric furnace is guaranteed, and the airtight, continuous and efficient smelting of the large-sized carbonization electric furnace can be realized.