The invention brings forward a calcium carbide furnace and a method for manufacturing calcium carbide by the utilization of the calcium carbide furnace. The calcium carbide furnace comprises a pyrolyzing furnace body, an electric furnace bottom, a pellet material inlet, a pyrolysis gas outlet and a calcium carbide liquor outlet. There is a pyrolysis cavity inside the pyrolyzing furnace body. The electric furnace bottom has a calcium carbide production cavity. The electric furnace bottom has a heating device. The top of the electric furnace bottom is connected with the lower end of the pyrolyzing furnace body such that the pyrolysis cavity is communicated with the calcium carbide production cavity. The pellet material inlet is arranged at the top of the pyrolyzing furnace body such that it is convenient to add a pellet material containing pulverized coal and lime into the pyrolysis cavity through the top of the pyrolyzing furnace body. The pyrolysis gas outlet is disposed on the upper part of the pyrolyzing furnace body. The calcium carbide liquor outlet is mounted on the lower part of the electric furnace bottom. By the adoption of the calcium carbide furnace, energy consumption can be remarkably reduced, and preparation efficiency of calcium carbide can be raised.