The invention provides a top and bottom composite blowing molten bath smelting technology and device. A plurality of spray gun insert holes are formed in the top of a furnace body. Feeding inlets anda floss hole are formed in the top of the furnace body and formed in the left and right ends of the furnace body correspondingly. Spray gun insert holes are formed in the bottom of the furnace body. Aslag tap and a copper-matte tap are formed in the two sides of the furnace body correspondingly. A nozzle is formed above the slag tap. The top and bottom composite blowing molten bath smelting technology and device have the advantages that a top blowing unit is additionally arranged at the top of the furnace body, elemental sulfur which is produced due to copper concentrate decomposition and cannot participate in oxidizing reaction completely fully reacts in a smelting furnace, a large amount of the elemental sulfur is prevented from entering a flue gas system, the boiler inlet flue gas temperature is decreased, a coking situation is alleviated, the molten bath smelting heat efficiency is improved, and meanwhile, top blowing high-speed airflow is utilized for reducing the phenomenon ofmelt splashing caused by bottom blowing.