The invention provides a marine hydraulic steering engine, which comprises a power pump set formed by hydraulic pump 4, an oil tank 10, a low liquid level alarm 1 arranged on the oil tank 10, an air filter 2, an oil-return oil filter 3, a pressure gauge 11, a steering mechanism 14, a position switch 21, a relief valve 13, a two-position four-valve solenoid directional valve 5, a three-position four-valve solenoid directional valve 6, steering engine special valves 7, 8, a double-linked stop valve 15, a flow amplifying valve 20, a steering gear 16, a limiting solenoid valve 17, a check valve 18, a reducing valve 19 and a flow amplifying valve 20. In the invention, the flow amplifying valve 20 is used in a main steering engine oil way and the small guiding oil flow of the steering gear 16 is utilized to drive the bigger pressure oil flow to enter into the steering mechanism by passing through the flow amplifying valve 20 so as to steer. The hydraulic steering engine can efficiently control the steering speed and has the advantages of good energy-saving effect, low cost, convenient mounting and maintaining.