The invention relates to a method for removing benzene from a carbon dioxide gas. The method comprises the following steps: mixing the benzene-containing carbon dioxide gas and a background gas to form a mixed gas to be treated; introducing the mixed gas to be treated into a catalytic reaction device, and performing a reaction removal treatment in the presence of a catalyst to obtain a middle gas;and introducing the middle gas into an adsorption device, and performing adsorption removal treatment in the presence of an adsorbent. According to the invention, most of the benzene in the carbon dioxide gas is reacted for removal through catalytic combustion, and then a small amount of the residual benzene is adsorbed for removal, so that benzene removal is efficiently realized by the catalyticcombustion; and adsorption removal can be performed under a normal temperature, the energy consumption is reduced, and higher purification requirements can be met, so that the high-efficiency and low-cost removal of the benzene can be realized.