The invention discloses a method for removing phosgene from TDI amine phosgenation reaction product. The method comprises in-tower steam stripping removing. According to the method, stripping is carried out by adding HCL tail gas and/or CO tail gas produced during the phosgenation process to the tower bottom. According to the invention, an auxiliary means is adopted that hydrogen chloride or carbon monoxide is added to the tower bottom for carrying out stripping, such that tower bottom steam addition amount is reduced; phosgene can be removed under a relatively low temperature. A tower bottom/middle reboiler is optional. Operations can be carried out under wide ranges of control parameters such as tower bottom temperature, stripping gas amount, and the like, and a phosgene removing effect equivalent to or better than that of a traditional design can be achieved. Also, product loss is reduced, energy consumption is reduced, heat exchanger fouling is avoided, and system safety performance is improved.