The invention discloses an oil-proof underwater motor driver. The oil-proof underwater motor driver structurally comprises a fixing frame, a fixing screw, a heat-radiating aluminum sheet, a mounting frame, a waterproof frame, a hinge, a device shell, a movable sealing frame, a connection terminal, a spring seat, a lateral push rod, a coordination frame, a waterproof layer, a mounting base, a mainpush rod and a spring rod carrier. The waterproof layer is located in the coordination frame and fixedly connected with the lateral push rod. The spring seat is located on the rear side face of the lateral push rod, and is matched with the spring seat. The spring rod carrier is located on the inner side surface of the coordination frame, and is connected with the coordination frame through the mounting base. The oil-proof underwater motor driver has the advantages that after the waterproof layer is applied, the motor driver can resist oil corrosion and water during working, so that the objective of improving underwater working of the motor driver can be achieved.