Coral gravel and coral sand was respectively used as coarse and fine aggregates, mixed with seawater and cement to prepare coral concrete. The 30.12143.32s-1 strain rate impact loading test was performed using the split Hopkinson bar(SHPB) system. Dynamic uniaxial compressive stress strain curves of coral concrete under different strain rates were obtained. Meanwhile, the effects of strain rate on dynamic strength growth, energy dissipation, failure mode and fracture fractal were studied. The results show that the dynamic increase factor(DIF) of coral concrete has a linear positive correlation with the 0.5 power of strain rate and is higher than that of same grade ordinary silicate concrete. Total strain energy, elastic energy and dissipated energy all have a linear positive correlation with strain rate, and dissipated energy ratio increases with increase of total energy. Different from the failure of common concretes cementation surface, coral concrete fracture surface caused by impact load often penetrates through coral aggregate. The fractal dimension of coral concrete fragmentation is linearly and positively correlated with logarithmic strain rate, which can be used to quantitatively characterize the degree of specimen fragmentation.