A power plant using sea waves comprising a float, a horizontal shaft. The float (1/1) of a spherical or cylindrical shape made with plastic or metal material, empty filled with ballast, floats half emerged and transfers the wave vertical motions to a vertical metal beam (1/2) which can be increased or decreased in order to deal with the tidal changes of the sea level. The vertical beam is attached with knuckle joins, at one end with the float and at the other with horizontal beam of rectangular metal triangle which transfers the vertical motions at the horizontally moving forwards and backwards saw (1/5) with the two chains (1/6) and (3/20) which rotate two pairs of gears each gear of a pair to the diametrically opposite side, so that with every movement one gear produces action while the other gear of the pair moves freely. The gears rotate the horizontal shaft which is fitted on them (3/8) and the shaft gives motion to the generator.