The utility model discloses a device capable of producing sulfur dioxide with sulfur slag. The device capable of producing the sulfur dioxide with the sulfur slag comprises a combustion furnace and a flue. One end of the flue is communicated with the combustion furnace and the other end of the flue is an output end. A filtering device is arranged on the flue and comprises a casing body, a filtering net and a platen. A filtering cavity is arranged in the casing body. The filtering net and the platen are arranged in the filtering cavity which is communicated with the flue. As the combustion furnace, the flue and the filtering device are additionally arranged, the technical problem that investment on additional equipment of a system of producing acid from sulfur or a system of producing bromine from sulfur is large is solved. Original stacked sulfur slag is combusted to generate sulfur dioxide gas for multiple procedures including procedures of producing sulfur and bromine. The waste sulfur slag is recycled to be valuables. The amount of added sulfur materials is reduced. Investment is low and cost is saved.