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To study the mechanical properties and failure modes of corroded reinforced concrete beams under impact, this paper conducts impact tests on concrete beams by Fujikake et al. The validity of impact force time history curve, mid-span displacement time history curve and failure mode of the fine finite element model of reinforced concrete beam structure established by finite element software ANSYS/LS-DYNA was checked. Based on the verified finite element model, the influence of corrosion rate of reinforcement on the impact resistance of concrete beams was researched. The finite element analysis shows that The concrete spalling degree of concrete member under impact effect increases with the increase of steel corrosion rate. The higher the degree of steel corrosion, the more serious the concrete spalling. All the corroded RC beams at different impact heights exhibit flexural failure characteristics. Steel corrosion has a certain influence on the impact resistance of reinforced concrete members. At the same drop weight impact height, the peak impact force decreases with the increase of steel corrosion rate, and the mid-span displacement increases with the increase of steel corrosion rate. When the impact height is 3.0m, the peak value of impact force decreases to 17.9% and the mid-span displacement is 33.3% when the corrosion rate is 30.0%. [ABSTRACT FROM AUTHOR]