Underwater automatic toppling docking block and usage method thereof

The invention discloses an underwater automatic toppling docking block and a usage method thereof. The docking block comprises a cement bottom block (1) of a cuboid structure. Lower bottom plates (3) extending to the outside are arranged on the two sides of the upper surface of the cement bottom block (1) correspondingly with the longitudinal center line as the center. 1-2 bearing uprights (5) are fixed on the position, located above the cement bottom block, of each lower bottom plate, wherein a loading box (4) used for holding a kentledge (10) is arranged on the plate face extending to the outside of the cement bottom block, the junction of the bottom face of the lower bottom plate and the edge of the cement bottom block is provided with a toppling hinge (2), and thus the lower bottom plate rotates round an articulated shaft of the hinge. The top ends of the bearing uprights located on the same lower bottom plate are provided with upper bottom plates (7). Wood base plates (11) are arranged on the parts, loca