The utility model discloses a can improve and unite circular smelting furnace of air feed formula at bottom of side of smelting reaction efficiency, including furnace body, feed inlet, air-supply line, arrange cinder notch and flue, set up the feed inlet on the furnace body, air-supply line and row's cinder notch, the furnace body top sets up the flue, the air-supply line is including side air-supply line and vertical air-supply line, vertical air-supply line setting is in the bottom of furnace body, the side air-supply line includes an overgrate air and cubic tuber pipe, a secondary air channel setting is in the lower part of furnace body, the cubic tuber pipe sets up the upper portion at the furnace body, set up the feed inlet on the furnace body wall between a secondary air channel and the cubic tuber pipe. The utility model discloses set up the furnace body into the cylinder to be provided with the air-supply line simultaneously with the bottom simultaneously on the furnace body side wall surface, the wind that comes from two orientations of looks vertically forms in the furnace body and mixes the irregular vortex, adds the cold burden and is hard to sink at the end with the heat material, has aggravated the reaction in the stove, has accelerated to change material speed, has practiced thrift energy consumption and time