Abstract: The deep piling project of coral rock puts forward a new scientific demand for understanding dynamic mechanical properties of coral rocks under confining pressure. Impact tests on coral rocks were carried out through split Hopkinson pressure bar (SHPB) with confining pressure, and mechanical responses of coral rocks under different confining pressures were obtained. Studies show that: in the absence of confining pressure, the dynamic compressive strength of coral rocks is the same as that of conventional rocks, and has obvious strain rate sensitivity; as confining pressure increases, not only the dynamic compressive strength of coral rocks increases significantly, but also its strain rate sensitivity is stronger. The failure strength formula was proposed with confining pressure and strain rate effects. The proposed failure strength formula in this paper has important reference value for deep overburdened coral rock geological pile foundation engineering.