A kinetic energy generation device includes a rotation mechanism, a speed increaser coupled to the rotation mechanism, and a power generation element coupled to the speed increaser. The rotation mechanism includes a central shaft and an outer circumferential zone surrounding the central shaft. The outer circumferential zone receives therein partition plates set in radial direction and spaced from each other so that the partition plates show upward inclination. The central shaft is rotatably coupled to the speed increaser, and the speed increaser is coupled to the power generation element so as to constitute the kinetic energy generation device. The rotation mechanism is arranged under a water flow in order to allow each of the receiving zones to receive a weight of water, so that the weight of water causes the rotation mechanism to rotate in a given direction and thus drives the speed increaser to generate electrical power.