An N-doped carbon dots corrosion inhibitor was synthesized by microwave method to improve the corrosion problem of ground pipe network under sulfur-containing acidic high-temperature environment. Its corrosion inhibition effect on N80 carbon steel in simulated solution at 25 ℃，60 ℃ and 90 ℃ was tested by electrochemical and weight loss methods. The results showed that the efficiency of corrosion inhibitor（ECI）increased with the increase of the temperature. The ECI reached the maximum of 94.16% at the temperature of 25 ℃ at the NCDs dosage of 150 mg/L. The maximum was 82.92% at the temperature of 60 ℃ at the NCDs dosage of 200 mg/L. At the temperature of 90 ℃ and at the NCDs dosage of 150 mg/L，it reached up to 69.59%. The analysis of corrosion morphology showed that the depth and number of corrosion pits on the steel were the largest at the temperature of 90 ℃. The adsorption isotherm curve showed that the adsorption equilibrium constant of NCDs was the largest at 90 ℃，but the local corrosion was more serious at high temperature. In addition，it is found that the adsorption type of N-doped carbon dots was physical and chemical mixed adsorption. The carbon dots corrosion inhibitor could effectively solve the corrosion of ground pipelines at high temperature and prolong the service life.