The utility model aims to provide a double pendulum formula wave energy electrical cell structure, including box wave energy extraction element, mechanical transfer device, energy storing device and energy conversion device. Box wave energy extraction element turns into the kinetic energy transmission of putting board pivot reciprocating rotation with the kinetic energy of wave through the pendulum board, the reciprocating rotation that mechanical transfer device will put the board pivot turns into unidirectional rotating and has solved two synthetic problems of the asynchronous motion that causes of pendulum board velocity of movement simultaneously, energy storing device plays energy storage effect, be used for the stabilized speed, reduce the influence that the wave strikes, power generation facility turns into ultimate electric energy with mechanical energy. The utility model provides a wasting of resources that the generator led to the fact of every pendulum case installation of traditional box swing wave energy power generation facility, unify to generate electricity after synthesize the energy of two pendulum casees, can absorb the wave force of full wave action on putting the board, carry high conversion efficiency by a wide margin.