The magnesium cement reinforced concrete components were soaked in chloride and sulfate solutions to accelerate the corrosion of the coated steel bars in the components. The electrochemical workstation was used for electrochemical tests； the corrosion current density was used as the durability degradation index of the steel bars to establish a unary Wiener process. The prediction model was used to predict the corrosion life of steel bars. The results have shown that the corrosion of steel bars in magnesium cement concrete components is more prominent in the chloride salt solution environment than in the sulfate solution environment， and the coating has a better protective effect on the steel bars in the two salt solution environments. In the chloride salt solution environment， the coated steel bars enter a moderate corrosion stage around 1 500 days， and the coated steel bars in sulfate solution environment enter a moderate corrosion stage at 22 000 days.