The invention relates to the field of steel smelting, and discloses a method for extracting vanadium through a combined blown converter. The method comprises the steps of mixing molten iron in the combined blown converter and further comprises the steps of blowing oxygen to the molten iron through an oxygen gun in the blowing stage, and blowing carbon monoxide or mixed gas of the carbon monoxide and nitrogen to the molten iron through a converter bottom air brick. According to the method, the carbon monoxide or the mixed gas of the carbon monoxide and the nitrogen is blown into the molten iron through the converter bottom air brick, a certain amount of carbon monoxide is added into the molten iron, the redox equilibrium relation among C, CO and CO2 is utilized for reducing the use number of cooling agents, and meanwhile reducing the oxygenation efficiency of carbon, the oxygenation efficiency of the vanadium is improved, the utilization rate of resources is optimized, and the vanadium extraction production cost is reduced.