The subject innovation is by using a falling force by the rising by buoyancy and the gravity of the tank with the float and the float and the operating turbine, to a power generation device that generates power. This devise is a tank slope mesh is installed on the inside top and bottom end side upper side opening of the tank has been chukseol the central axis one has installed a guide through the box combined net basket with integrally bonded to the top of the tank, the flow pin and one to install the operating hydraulic cylinder connected to the lower end as a guide through the box and the side shaft construction, water tank and close the upper and lower support gear and an outer surface with a plurality of chain belt and chain belt wound around a drive gear number mounting the basket at equal intervals, and the drive shaft of each drive gear is in association with a plurality of teobigwa drive belt structure, the upper float guide pipe upper part, centered on the chain belt, and a lower portion that respectively the lower float guide tube on the other hand, the bottom portion of the lower float guide tube, install a horizontal work hydraulic cylinder that has an upper surface and a series of related configurations to form a receiving groove for supplying the float to float to accommodate the inner tank characterized. Tank, buoyancy, opening slope nets, Single shaft, chain belt, basket, hydraulic cylinders