A device for condensing furnace gas in the process of generating element phosphorus by an electric furnace process relates to a method for producing the element phosphorous, in particular to a device for condensing and decomposing the furnace gas in the process of generating element phosphorus by an electric furnace process. The device comprises condensing towers, phosphorous receiving tanks, a gas guide tube and an exhaust tube, and is characterized in that: the number of the condensing towers is at least four, the number of the phosphorous receiving tanks is 1-4, two adjacent condensing towers are alternately connected in a top communication way and in a bottom communication way, the bottom of the condensing towers is communicated with the phosphorous receiving tank, the head tower of the condensing towers is communicated with the gas guide tube, and the tail tower is communicated with the exhaust pipe. The device has reasonable structure, prolongs residence time of the furnace gas, increases recovery rate and reduces dust-laden factors in the furnace gas, thus achieving the purpose of energy saving and environment protection.