Double-horizontal reversely-buckled bottom shaft-driven flap gate

The invention discloses a double-horizontal reversely-buckled bottom shaft-driven flap gate. The flap gate comprises a civil foundation, a gate, two sets of working opening and closing devices and two sets of lifting opening and closing devices, wherein the civil foundation comprises a bottom plate and side piers on the two sides; fixing grooves and overhauling grooves are formed in the side piers on the two sides; the gate comprises a gate main body, strong boundary beams, a bottom shaft, top cantilever wheels and bottom cantilever wheels; the strong boundary beams on the two sides are fixed in the fixing grooves correspondingly; the bottom shaft is welded at the bottoms of the strong boundary beams; the top cantilever wheels are correspondingly fixed at the upper end parts of the outer sides of the strong boundary beams; the bottom cantilever wheels are fixed to the two ends of the bottom shaft correspondingly, and the bottom cantilever wheels are limited in the fixing grooves; the two sets of working openi