Double-detection coupler for submarine cable

The utility model relates to a double-detection coupler for a submarine cable, which comprises a coupler base, brackets for fixing the coupler, coupler side walls and coupler round holes, wherein the coupler base, the coupler side walls and the brackets for fixing the coupler are connected in a welding way; and four coupler round holes are arranged on the coupler side walls. The water-detection end of the double-detection submarine cable is fixed at the left side of the coupler by using a light and thin rope, and the water-detection part is exposed out of the coupler. The ground-detection end of the double-detection submarine cable is fixed at the right side of the coupler, and the ground-detection part cannot be exposed out of the coupler. The water-detection part is fixed on the double-detection coupler, the water-detection part and the double-detection coupler are together thrown into the seawater, and the double-detection coupler can then sink into the bottom of the sea by depending on the mass per se. Du