The utility model discloses a wave power generation device, which comprises a keg float, a lead rail, a magnet and a coil and is characterized in that the keg float is a columniform sealing keg, the water displacement thereof is enough to enable the power generation device to float on the water surface; the lead rail is arranged on a pipeline or a bracket inside a keg float chamber along the long direction; the magnet is arranged inside the pipeline or on the bracket of the lead rail; the magnet is a long block, is movably combined with the lead rail, and can slide along the lead rail freely, and the size of the magnet adapts to the lead rail; the coil wraps the periphery of the lead rail, and a lead is arranged and led out from the keg float. The wave power generation device has the advantages of simple structure, reliable power generation effect, easy manufacture, convenient installation and fewer faults, and is suitable for mass production and popularization.