Abstract: In order to improve the durability of concrete in complex environment and ensure the design service life of the structure, the damage mechanism of mechanical properties of steel fiber reinforced concrete with plain concrete without fiber content（0%） and different steel fiber content（1%, 2%） under different environmental erosion conditions was analyzed based on C30 concrete. Six environmental factors were selected, namely: water, freeze-thaw cycle, sodium chloride solution, sodium sulfate solution, dilute sulfuric acid solution and sodium hydroxide solution. The degradation laws of microstructure and axial bearing capacity under different erosion environments were comparatively analyzed. The test results showed that the addition of steel fiber can effectively improve the axial bearing capacity of concrete, but the growth rules were different under different erosion conditions. The best content of steel fiber was 1% in the environment of sodium chloride and sodium sulfate, and 2% in the environment of freeze-thaw cycle, dilute sulfuric acid and sodium hydroxide. The research results will provide theoretical basis for predicting the performance deterioration of steel fiber reinforced concrete under different erosion conditions and periods.