The invention discloses a smelting furnace of a molten bath. The smelting furnace of the molten bath comprises a furnace body and a plurality of spray guns, wherein a furnace chamber is arranged in the furnace body and is provided with a circular cross section, the side wall of the furnace body is provided with a plurality of spray gun insertion holes which are peripherally formed along the furnace body at intervals, and the plurality of spray guns are inserted into the spray gun insertion holes and are deviated from the center of a circle of the circular cross section of the hearth in the same direction. The smelting furnace of the molten bath provided by the invention has the advantages of low energy consumption and good smelting effect.