The invention discloses a marine safe combined device which is arranged between a deck of a rescue boat crane and a deck of a gangway ladder and arranged outside the gangway ladder. The marine safe combined device comprises a base fixedly arranged on the deck of the gangway ladder. A panel is arranged on the top of the base. A containing cavity is formed in the lower side of the panel. At least one partition plate is fixedly arranged in the containing cavity and transversely distributed. Limiting through holes are formed in the partition plates and the panel. The deck of the rescue boat craneis provided with a downwards-extending side extending section. The bottom of the side extending section is provided with transversely-distributed clamping plates. Clamping grooves are formed in the clamping plates. Stop rods are arranged between the clamping plates and the base and penetrate through the limiting through holes. The lower ends of the stop rods are clamped in the containing cavity. The upper ends of the stop rods are clamped in the clamping grooves. By means of the marine safe combined device, the safety of lifting up and putting down a rescue boat is greatly improved, and the performance of a ship on the aspect of life saving is improved; the marine safe combined device is compact in structure, convenient to detach and assemble and low in manufacturing cost.