The invention provides a method for removing carbon in high-carbon copper-containing molten iron through injection of carbon dioxide and belongs to the field of metallurgy. The method comprises the following steps that firstly, the high-carbon copper-containing molten iron is guided into an induction furnace; secondly, carbon dioxide gas is injected into the high-carbon copper-containing molten iron, and stirring is conducted; thirdly, when the mass percent of the carbon in the high-carbon copper-containing molten iron is smaller than or equal to 0.2%, injection is stopped; and fourthly, carbon monoxide is post-processed to generate carbon dioxide, the carbon dioxide is recycled, and the copper-containing molten iron is separated from slag. According to the method, the injected carbon dioxide reacts with the carbon in the melt to generate carbon monoxide, after escaping, the carbon monoxide is combusted to regenerate the carbon dioxide, and the carbon dioxide returns to be used; and besides, the carbon dioxide is a weak-oxidation gas and cannot react with copper, and the carbon dioxide further has the dephosphorizing function and the desiliconization function. By the adoption of the method for removing the carbon in the high-carbon copper-containing molten iron through injection of the carbon dioxide, the technology is simple, a stirring system is additionally arranged in the induction furnace, energy is saved, environmental friendliness is achieved, the cost is low, the greenhouse gas is utilized, and therefore the high economic value and the good environmental protection function are achieved; and the purpose of removing the carbon is achieved, and the copper element in the high-carbon copper-containing molten iron can be protected against the burning loss.