The durability of steel fiber reinforced concrete(SFRC) was investigated under the combined effects of carbonization and acid rain erosion by testing mass change rate, splitting tensile strength change rate, corroded depth and neutralization depth. Test results indicate that the concrete corrosion under the acid rain erosion effect is accelerated by carbonization. Under the combined effects of carbonization and acid rain erosion, the concrete mass loss rate, splitting tensile strength loss rate and corroded depth are greater than those of concrete under the acid rain erosion effect alone, and the neutralization depth is larger than the superposition of that under the acid rain erosion effect and that under the carbonization effect. The effect of carbonization and acid rain erosion has almost equal contribution to the neutralization of concrete. Proper mixture of steel fiber can effectively inhibit the concrete corrosion under the acid rain erosion effect and reduce the neutralization speed. The concrete with 15%(by volume) steel fiber is of the optimal durability.