The utility model provides an automobile vibration energy repayment bumper shock absorber belongs to vehicle engineering technical field. The vibrations mechanical energy that produces when it can be solved the automobile effectively and goes turns into the problem of electric energy. The cover cover is fixed with outer conical spiral tooth axle lower extreme, inner transmission shaft and outer transmission shaft are the variable diameter hollow shaft, and thrust bearing's inner circle is with inner transmission shaft and outer transmission shaft's tip external diameter interference fit and through shaft shoulder location, external diameter that two upper and lower one -way shaft held respectively with inner transmission shaft and outer transmission shaft's main aspects internal diameter interference fit, the internal diameter that one -way shaft held is fixed with interior conical spiral outer diameter of the gear, upper end internal diameter and the lower extreme internal diameter and the thrust bearing outer lane interference fit of lower sleeve, inner transmission shaft's upper end outer wall and outer transmission shaft's lower extreme inner transmission shaft 1, pass through the key cooperation and send out motor input shaft to be connected in outer transmission shaft's upper end, it is fixed with last sleeve up end that the generator passes through the screw. Mainly used supplyes for electric automobile provides the electric energy.