Flood discharge gate device

The flood discharge gate device comprises a gate body, a plurality of energy dissipation and flow breaking mechanisms, a pressure reduction plate and a traction mechanism, the bottom of the pressure reduction plate is rotationally connected with the middle of the gate body, and the top of the pressure reduction plate is connected with the top of the gate body through the traction mechanism; the energy dissipation and flow breaking mechanisms are rotationally connected with the bottom of the gate body, when the gate body is opened for flood discharge, the traction mechanism can enable the maximum included angle to be formed between the gate body and the pressure reduction plate, and under the impact of water flow, the energy dissipation and flow breaking mechanisms can rotate. During flood discharge, the included angle between the pressure reduction plate and the gate body can be adjusted through the traction mechanism, so that the pressure reduction plate can counteract the top water pressure, the water press