The invention belongs to the technical field of traffic safety and particularly relates to a water-storage-type impact energy-absorption device. The device comprises a shell and partition plates whichare fixed to the interior of the shell and are of a face body structure, the partition plates are parallel and are evenly arrayed at intervals, every two adjacent partition plates are fixedly connected into an integrated structure by multiple reinforcement ribs perpendicular to the corresponding to the two adjacent partition plates, and the reinforcement ribs are parallel and are evenly arrayed at intervals; through holes communicated with all cavities are formed in the partition plates and the reinforcement ribs, and it is guaranteed that water flow can flow into all the cavities; an inlet and an outlet which are communicated with the internal cavities are formed in the upper portion of the shell, and non-metal pipe plugs are arranged at the inlet and the outlet. The water-storage-type impact energy-absorption device has the advantages that the structure is ingenious, a mode of combining water with a flexible material is adopted, the flexibility is good, the energy absorption effectis good, the device is safe and reliable, smashing or breaking cannot occur, and secondary injury cannot be caused to vehicles or personnel.