The invention discloses a wellhead treatment device for carbon dioxide flooding well products. The wellhead treatment device for the carbon dioxide flooding well products comprises a tank body, a first partition plate, a second partition plate, an inlet pipeline, a liquid collection pipe, a dirt discharge pipe, a chemical adding pipe, a first hole and a first top cover, the first partition plate and the second partition plate are arranged inside the tank body, the inlet pipeline, the liquid collection pipe and the dirt discharge pipe are arranged at the front end of the tank body, the chemicaladding pipe and the first hole are arranged on the upper surface of the tank body, the first top cover is arranged on the first hole, the first partition plate and the front end of the tank body forman inlet dissolving bin, the first partition plate and the second partition plate form a transition mixing bin inside the tank body, and the second partition plate and the rear end of the tank body form a gas recovery bin. A liquid product, a gas product and a solid product of the products are separated through the inlet dissolving bin, the transition mixing bin, the gas recovery bin and the chemical adding pipe to be treated separately, so that the resource utilization rate is increased, the environment is protected, harm to workers is reduced, and damage to gathering and transportation equipment is reduced.