The invention provides a method for reducing acid corrosion to oil, which comprises the following steps: mixing acid-containing oil with a corrosion inhibitor; and treating the mixture at a temperature lower than 200 DEG C to reduce acid concentration of the oil. The corrosion inhibitor is selected from a) aziridine, b) a mixture of epoxides and a catalyst, and c) a composition of a and b, wherein the catalyst is selected from amine compounds, quaternary ammonium salts, quaternary phosphonium salts, and compositions of the above.