Hydraulic control seawater valve with adjustable opening

The invention belongs to the field of underwater robots and hydraulic transmission, and particularly relates to an opening-adjustable hydraulic control seawater valve which comprises a high-pressure stop valve and an opening hydraulic control adjusting mechanism, and the opening hydraulic control adjusting mechanism comprises a hydraulic motor, a coupling, a height adjusting ring, a pressing ring, a rotary encoder and a watertight connector. The hydraulic motor, the coupling, the height adjusting ring, the pressing ring and the high-pressure stop valve are sequentially connected in a sealed mode, a rotary encoder is arranged in the coupling, a movable disc of the rotary encoder is connected to a motor output shaft of the hydraulic motor, and a static disc of the rotary encoder is fixed into the coupling. A handle mounted on an adjusting screw rod of the high-pressure stop valve extends into the coupling, and the end part of a motor output shaft of the hydraulic motor is opened and clamps the handle; a waterti