To model the seismic behavior of corroded reinforced concrete columns accurately, in this paper, based on the existing research results, a bond-slip constitutive model between corroded steel bar and concrete under cyclic loads was established. The validity of the bond-slip model was then verified by the ABAQUS finite element analysis software. The friction bond stress and bond degradation coefficients in the bond-slip model were further corrected by analyzing the error between the numerical calculation results and the test results, and a more reasonable bond-slip constitutive model between corroded steel bars and concrete was established. The validity of the modified model was verified by comparing the numerical results with the experimental results again. The results showed that the modified bond-slip model can better reflect the hysteretic performance of corroded reinforced concrete columns under cyclic load. The results can provide a theoretical reference for the numerical analysis and calculation of corroded reinforced concrete structures under earthquake.