The invention relates to the technical field of a mechanical oil production technology in oil development, belongs to CO2 flooding anticorrosion and gas control lifting technologies, and is designed for solving the corrosion on an oil-well pump body and the adverse influences on pump efficiency by a large amount of CO2 gas exploited from a well in CO2 flooding oil well exploitation. The technology mainly comprises the steps that produced fluid is firstly subjected to a CO2 flooding anticorrosion and gas control device consisting of a spiral tube 5 and an outer tube 3 so as to separate and discharge the large amount of CO2 gas from a gas-fluid mixture in case that the CO2 gas enters an oil-well pump 4, and fluid enters into the oil-well pump 4 after separation to guarantee the normal production of a production well. The invention is suitable for the lifting system of all CO2 flooding oil wells, and has the advantages of improving the service life and the pump efficiency of the oil-well pump, preventing the corrosion of the large amount CO2 in the production well to the oil-well pump body and the like.