The fatigue damage model parameters of HRB400steel bar were obtained through testing. According to the pit morphology and fatigue test results of corrosion accelerated steel bars, the high cycle fatigue life prediction and damage process analysis of pitted corroded steel bars were realized through secondary development on the Abaqus platform. The results show that the fatigue life prediction results agree well with the experimental values. There is stress concentration at the pit, and the fatigue damage is concentrated near the bottom of the pit. The damage in the early and middle stages of fatigue develops slowly, and then accumulates rapidly at the end of fatigue life. The elastic modulus of the material decreases with cyclic loading. The stress at the bottom of the pit drops to a lower value rapidly at the late stage of fatigue life and shifts to the periphery, and stress redistribution occurs.