For high-quality weathering bridge steel, it is not only required to have excellent low-temperature impact toughness, but also to have higher requirements for its corrosion resistance. The effects of different calcium treatment processes on low-temperature impact and corrosion resistance of weathering bridge steel were studied. The test results showed that compared with the traditional calcium treatment process, the improved calcium treatment process improved the yield of [Ca] in molten steel. In this way, the calcium treatment process was sufficient and the test steel plate with better low-temperature impact performance was obtained. Compared with the original calcium treatment process, the impact energy of the test steel increased by 5.3% at －20 ℃and 7.5% at －40 ℃. Compared with ordinary Q420qE steel, calcium treatment II increased the relative corrosion rate from 43.5% to 32.40%. Moreover, the rust layer of accelerated corrosion specimen had clear texture and relatively high density. XRD analysis result showed that the content of the α-FeOOH crystalline phase in the rust layer reached 91.8%, and the corrosion resistance was improved.