The invention relates to a wave-force power generation method and a wave-force power generation device. For the method, the wave-force power generation device consists of a maritime part and a shore-based part, wherein the maritime part is a wave force machine of which rollers at the lower end of a machine frame runs on a rail of the machine frame, so that the wave force machine can be placed under the sea or onshore. A wave gathering cover of the wave force machine gathers wave energy in a suitable compression ratio, and sends the wave energy to a plurality of different energy gathering cylinders, according to the water yield of the control signal water drain openings of the energy gathering cylinders with the control function, wave heights control the running states of the energy gathering cylinders to enter or withdraw from a combined equivalent energy gathering cylinder so as to output mechanical energy, pneumatic energy and hydrodynamic energy which are output in a complementary and stable manner, and after being supercharged and stored, the mechanical energy, the pneumatic energy and the hydrodynamic energy are sent to the shore-based part under the control of a rotating speed testing and controlling device; namely the mechanical energy, the pneumatic energy and the hydrodynamic energy are sent to inlets of an air turbine and a water turbine in an ashore machine room through pipelines so as to drive the rotating speed and the torque of a transmission main shaft according to the size of the wave heights, and the rotating speed testing and controlling device is coupled with the transmission main shaft through a plurality of independent overrunning clutches arranged on generators so as to allocate the gathered energy of the wave gathering cover to be matched with a loaded power generation set. The wave-force power generation device disclosed by the invention is designed by the method.