Mooring positioning device for open caisson and construction method of mooring positioning device

The invention relates to the field of mooring positioning technology and discloses a mooring positioning device for an open caisson and a construction method of the mooring positioning device. The device comprises front positioning structures, rear positioning structures, left side anchoring ingots, right side anchoring ingots, fair leads, mooring ropes and mooring rope take-up devices. The front positioning structures and the rear positioning structures are arranged on the upstream position and the downstream position of the open caisson, and the left side anchoring ingots and the right side anchoring ingots are arranged on the left side and the right side which are perpendicular to the water flow direction; the fair leads and the mooring rope take-up devices are arranged on the open caisson in a one-to-one correspondence mode; one side anchoring ingot is connected with one mooring rope take-up device through one set of mooring ropes via one fair lead, one positioning structure is connected with one mooring rope take-up device through one set of mooring ropes via one fair lead, and acting points of the mooring ropes are located at riverbed positions of the positioning structures. The device is a rigid positioning system with a few mooring ropes, the positioning structures and the side anchoring ingots correspond to top positioning devices of the open caisson one to one through the mooring ropes so that definite stressing can be achieved, and the positioning structures are stressed on the riverbed surface. The device is free of deepwater influences, easy to construct, capable of accurately positioning the open caisson and high in work efficiency.