The waterproof sealed junction box serves as an intermediary hub for control cables and signal lines on automatic hydraulic grabs. Operating alongside the grab in deep-water environments, it is typically subjected to sealing pressures of up to 7 MPa; consequently, its sealing technology must be executed with exceptional precision. This waterproof sealed junction box is constructed from 304 stainless steel tubing with a wall thickness of 10 mm, assembled through a combination of welding and bolted connections. Its components include the sealed box housing, cover plate, waterproof sockets, cable glands, O-rings, pressure-resistant rubber rings, and other related elements.