Depression project-under-construction flooding resistant structure and construction method thereof

The invention belongs to the technical field of buildings and particularly relates to a depression project-under-construction flooding resistant structure which comprises a baffle plate, L-shaped earwalls arranged on the two sides of the baffle plate and a supporting system for fixedly connecting the baffle plate and the horizontal ground surface; the baffle plate consists of a plurality of baffle plate units; two supporting ribs which are intersected in a diagonal direction are arranged on the back surface of each baffle plate unit and are fixedly connected with the back surface of each baffle plate unit; a fixed hinged plate is welded to the center of each supporting rib and comprises a welding plate; two parallel triangular bracing plates are arranged on the back surface of each welding plate; the right-angle edge of each triangular bracing plate is perpendicular to the corresponding welding plate; each triangular bracing plate is provided with a bolt hole; and a hinged moving boltis arranged between every