Accessory for generating power by using sea water wave

The invention discloses a mechanical device which generates electricity by using sea wave, which comprises a cylindrical doliform guide rod, a floater with a cylindrical doliform guide tube, a cylindrical doliform movable rod, a triangle beam, a transfer rod, a piston water pump and a water wheel generator, wherein the guide rod is fixed at the sea bottom vertical to the sea water plane, the guide tube on the floater is sleeved on the guide rod, the movable rod is inserted in the guide rod, two ends of the triangle beam are connected to the top of the movable rod, a cardan joint is connected to the middle of a lower side surface of a lower chord of the triangle beam, an upper end of the transfer rod is connected to the other end of the cardan joint, a lower end of the transfer rod is connected to a piston and is inserted in the water pump, the water pump is fixed on the floater by crossing the middle of the floater, and a lower end of the water pump is a horn mouth in shape with a flange and is connected to t