2205 stainless steel has good corrosion resistance due to its typical duplex organization, but the increasingly harsh CO2-containing oil and gas environment leads to different degrees of corrosion, especially pitting corrosion, which seriously threatens the safety and reliability of oil and gas development. In this paper, the effect of temperature on the corrosion behavior of 2205 duplex stainless steel (DSS) in simulated solution containing 100 g/L Cl- and saturated CO2 was investigated immersion test and electrochemical test, and combined with characterization techniques such as laser confocal microscopy and X-ray photoelectron spectroscopy etc. The results showed that the average critical pitting temperature of 2205 DSS was 66.9 °C. When the temperature was higher than 66.9 °C, the pitting breakdown potential, the passivation interval, and the self-corrosion potential, while the dimensional passivation current density increased, and the pitting sensitivity was enhanced. With the further increase of temperature, capacitive arc radius of 2205 DSS became smaller, film resistance and charge transfer resistance gradually decreased, the carrier density of donor and acceptor the product film layer with n+p type bipolar characteristics also increased, the inner layer of the film of Cr oxide content decreased, while the outer layer of Fe oxide content increased, the dissolution of the film layer sped up, the stability reduced, and the number and pore size of pits increased.