The utility model relates to a marine machinery technical field especially relates to a steering wheel hydraulic pressure constant pump station, including the liquid reserve tank, including a motor, an end cap, a controller, and a cover plate, the oil circuit piece, the solenoid valve, the liquid filter returns, the pipeline, inhale oil filter and constant pump, be equipped with liquid storage space in the liquid reserve tank, be equipped with the liquid outlet on the oil circuit piece, the liquid mouth returns, the mouth is taken over to first takeover mouth and second, the fixed top of locating the liquid reserve tank of motor and oil circuit piece, the solenoid valve is fixed to be located on the oil circuit piece, and rather than the connection, the liquid filter returns, inhale that oil filter and constant pump are fixed to be located in the liquid storage space, return the liquid filter pass through the pipeline through first takeovers mouthful connect in the oil circuit piece is inhaled oil filter and is passed through the pipe connection and take over in the constant pump and through the second and mouthful connect in the oil circuit piece, and the constant pump is connected in the motor. It is simple structure not only, and convenient assembling has guaranteed boats and ships and in low -speed, the normally time of rudder movement requirement under the operating mode such as navigation and diesel engine hypervelocity, and has compromise the different work condition requirement.