A wave energy conversion device comprising: - a first blade, - a second blade arranged under the first blade, parallel to the fist blade; one end of the first blade and second blade being rigidly fixed together; - a plurality of posts arranged parallel each others and connected to the first blade and second blade by means of hinges, so that a quadrilateral is formed between two posts and two sections of the first and second blades between the two posts; - floats connected to the hinges on the side of first blade, so that the first blade is arranged horizontally, substantially parallel to a water surface; - an armature intended to be fixed; the armature being connected to the one end of the first blade and second blade which is rigidly fixed together, so that the device is installed at a certain depth under the water, in the direction of wave propagation, - hydraulic cylinders or rotary hydraulic motors, wherein when there are the hydraulic cylinders, each hydraulic cylinder is arranged between a hinge on the first blade and a hinge on the second blade, in diagonal with respect to the quadrilateral formed between two posts and two sections of the first and second blades between the two posts; and when there are rotary hydraulic motors, each rotary hydraulic motors is arranged in a hinge on the side of second blade; - a pressure pipeline and a supply pipeline connected to the hydraulic cylinders or first rotary hydraulic motors; - a hydraulic turbine or a main hydraulic motor connected to said pressure pipeline; - an electric generator connected to said hydraulic turbine or a main hydraulic motor. - a first blade, - a second blade arranged under the first blade, parallel to the fist blade; one end of the first blade and second blade being rigidly fixed together; - a plurality of posts arranged parallel each others and connected to the first blade and second blade by means of hinges, so that a quadrilateral is formed between two posts and two sections of the first and second blades between the two posts; - floats connected to the hinges on the side of first blade, so that the first blade is arranged horizontally, substantially parallel to a water surface; - an armature intended to be fixed; the armature being connected to the one end of the first blade and second blade which is rigidly fixed together, so that the device is installed at a certain depth under the water, in the direction of wave propagation, - hydraulic cylinders or rotary hydraulic motors, wherein when there are the hydraulic cylinders, each hydraulic cylinder is arranged between a hinge on the first blade and a hinge on the second blade, in diagonal with respect to the quadrilateral formed between two posts and two sections of the first and second blades between the two posts; and when there are rotary hydraulic motors, each rotary hydraulic motors is arranged in a hinge on the side of second blade; - a pressure pipeline and a supply pipeline connected to the hydraulic cylinders or first rotary hydraulic motors; - a hydraulic turbine or a main hydraulic motor connected to said pressure pipeline; - an electric generator connected to said hydraulic turbine or a main hydraulic motor.