NOVELTY - Hydraulic jet device includes water conduit made in the form of system of channels with inlet water intake holes, which is located symmetrically relative to its longitudinal axis, vertical side walls common for all channels and horizontal curved walls in cross section of the channels, which form nozzles converging in the flow direction, which are meant for conversion of mechanical energy of the ship's pitching to hydraulic jet energy. At that, on each side wall of channels on outer side of water conduit there is vertical chamber with inlet hole on the side of front side of water conduit; vertical side walls have front and rear edges which are chamfered in the flow direction, each of which forms an angle respectively on the inlet side, to water conduit and on outlet side from it with vertex of an angle, which is located on longitudinal axis of water conduit; water conduit has upper and lower external channels, at least two internal upper and two internal lower channels and one central channel; at that, inlet water intake hole of central channel is located vertically, perpendicular to water conduit longitudinal axes; external walls of upper and lower external channels are concave relative to water conduit longitudinal axes; upper and lower walls of upper and lower internal channels respectively, which are common with channels adjacent to them of upper and lower external and internal channels, as well as upper and lower walls of central channel consist of straight plates with concave inlet section relative to water conduit longitudinal axis; at inlet of central channel in the middle between its horizontal curved walls there installed with possibility of being bent relative to its inlet edge is horizontal flat plate the inlet edge of which protrudes forward and is located in front of inlet water intake hole of central channel; at the inlet of external and internal channels there installed are flow turbulators made in the form of the rods located in middle section between curved walls across the flow entering the channels, and vertical chambers are formed with concave plates located along rear edge of vertical side walls so that concave plates form together with side walls of water conduit the convergent-divergent nozzles.    USE - Power industry.    ADVANTAGE - Increasing use efficiency of hydraulic jet device at conversion of pitching energy of ship to hydraulic jet energy. 3 dwg