The utility model relates to a shaft energy absorber, including the shaft, the inside of shaft is equipped with vertical partition wall will the space separation at well lower part to the top of shaft is for doing district and wet district, be equipped with a plurality of baffles in the wet district, the baffle includes certainly vertical partition wall to multistage second baffle that the shaft internal face extends and being located the multistage first baffle of second baffle both sides, first baffle with the second baffle is crisscross the distribution in vertical orientation, lies in a high position the baffle can be with falling into the sluicing direction low level on it on the baffle. The utility model provides a shaft energy absorber, at the energy dissipation in -process, the rivers energy in the shaft dissipates in grades, further improves through the head -on collision between rivers and falls a class energy dissipation ratio, has avoided the influences such as enormous impact power, large amplitude and high noise that concentrated energy dissipation brought to simple structure, construction convenience.