The utility model relates to an underwater hydraulic valve box control device. The underwater hydraulic valve box control device comprises an embedded controller, and a relay, a communication interface, a temperature sensor and a pressure sensor which are all connected with the embedded controller. The embedded controller, the relay, the communication interface, the temperature sensor and the pressure sensor are all arranged in an underwater hydraulic valve box which is filled with hydraulic oil. The relay is connected with hydraulic valves in the underwater hydraulic valve box. The communication interface is connected with a water surface controller through a watertight cable. The underwater hydraulic valve box control device has the advantages of greatly high in integration level, capable of simultaneously controlling the hydraulic valves and working under hyperbaric environment filled with hydraulic oil. Accordingly, the sealing reliability is improved, and the cost is reduced.