The invention relates to a geotechnical test technology and aims to provide a super-gravity rainy and strong slope rainfall simulation device comprising a model box mounted on a super-gravity centrifuge, wherein a slope model and a rainfall system are provided in the model box, the rainfall system comprises a plurality of sets of nozzles arranged relative to the surface of the slope model; each set of nozzles is composed of an air atomizing nozzle, a circle atomizing nozzle and a square atomizing nozzle, and the three nozzles are arranged in a triangle shape with their symmetrical centers; each nozzle is connected to three water branch pipes according to their types, and electric control valves are arranged on each water branch pipe. The device solves the problem that the rainfall intensity cannot be widely adjusted in the existing super-gravity test, and takes into consideration the requirements of the raindrop size and the rainfall uniformity in the super-gravity test.