Multifunctional engineering buoyancy tank device for cofferdam construction

The utility model discloses a multifunctional engineering buoyancy tank device for cofferdam construction, which comprises a buoyancy tank main body, the top of the buoyancy tank main body is fixedly provided with a lower loading platform, the top of the lower loading platform is provided with two rectangular sliding chutes, the two rectangular sliding chutes are respectively and rotatably provided with two threaded rods, and the thread turning directions of the two threaded rods are opposite. The two threaded rods are both sleeved with rectangular sliding seats in a threaded mode, and the tops of the two rectangular sliding seats extend out of the corresponding rectangular sliding grooves correspondingly. The carrying platform is reasonable in design and good in practicability, the distance between the two upper carrying tables can be conveniently increased and adjusted, a plurality of components can be conveniently transported at the same time on the carrying platform formed by combining the lower carrying