The utility model provides a rainfall simulation, illumination, wind harm device of mechanism to bank slopes rock, includes rain making system, illumination system, base, the base is equipped with the outlet. Be equipped with experiment appearance casing on the base, rain making system, illumination system are respectively through recess and experiment appearance shell assembly. Be equipped with the sample bracket in the experiment appearance casing, on the sample bracket was arranged in to the rock specimen board, at the windy impeller of experiment appearance casing mid -mounting, wind install impeller was on the hob, and the motor is connected to the hob. The utility model discloses not only can rainfall simulation, can also simulate illumination and blow these two kinds of natural erosion the damage of rock, provide convenience for the research of rock damage mechanism.