Ballast water tank based on gear shear fork mechanism

The invention discloses a ballast water tank based on a gear shear fork mechanism. The ballast water tank comprises a water tank shell and a water absorption and drainage device, the water tank shellis of an integrated sealing structure composed of a water pipe, an end cover, a cylindrical side wall and a lower support, and the water tank shell is communicated with the outside through the water pipe; the water absorption and drainage device comprises a shear fork mechanism and a driving device, and the shear fork mechanism and the driving device are arranged on the inner side of the lower support. According to the invention, the water absorption and discharge capacity is higher; the underwater robot or the submersible vehicle can dive or float up more quickly; under the condition that thefloating and sinking conditions are met, the internal space of the underwater robot or the submersible vehicle can be greatly saved, water absorption and drainage under the deep sea high water pressure condition can be achiev