In order to study the energy transfer law of simulated rock containing parallel joints under impact loading，cement mortar meterial was used to simulate rock the ratio of mortar and plaster was adjusted to make the joints. With the help of the disconnect-type SHPB equipment，the rule of energy transfer， strength characteristics，and failure mode of specimens with different joint spacings under the similar impact velocity were studied.The experimental results showed that， in the condition of the same low-velocity impact， the proportion of reflected wave energy， transmitted wave energy and dissipative wave energy were affected by the jointed spacing. The larger the jointed spacing was， the smaller the fragmentation was. The energy transfer law of the two parallel cracks with 18 mm gap of simulated rock specimens was closely related to the impact velocity， and the energy dissipation ratio can characterize the macroscopic failure characteristics. Damage variable with the impact speeds presents an increase weak power function relationship，where d stands for damage variable and v stands for impact speeds in this formula，and the damage value of the specimen is about 0.72. The results of this study provides a reference for the analysis of the excavation supporting and stability controling of multi jointed soft rock under underground engineering.