Floating box culvert type water gate construction device

A floating box culvert type water gate construction device provides a water gate prefabricated floating construction ship and comprises a flat ship, a tug, a controller and a positioning instrument. The device is characterized in that a sinking and floating cabin is arranged in the middle of the flat ship, balancing cabins are arranged at four corners of the flat ship, water inlets, electromagnetic valves and water pumps are arranged at the bottoms of all cabins, air openings and manholes are arranged on the tops of the cabins, and movable GPS positioning antennas are arranged on a ship head and a ship tail. Cofferdam construction and foundation pits for drainage can be omitted during water gate construction, prefabrication, floating transporting, launching, positioning and installation of a box culvert are completed by the construction ship, and the construction device has the advantages of convenience for construction without interference, simplified procedure and expense economization, and is widely applic