Automatic lifting water retaining device for urban rail transit low ventilation pavilion

The invention discloses an automatic lifting water retaining device for an urban rail transit low ventilation pavilion, and belongs to the technical field of urban waterlogging prevention. The ventilation pavilion comprises a shell, a water baffle, a driving plate, a water storage tank and a gear shifting mechanism, the shell surrounds the inner wall of a ventilation pavilion wall, the water baffle, the gear shifting mechanism and the driving plate are arranged in a cavity of the shell from outside to inside, the water baffle and the driving plate are reversely pushed to descend and ascend through gear rolling of the gear shifting mechanism, and the water storage tank is fixed to the bottom of the driving plate. A water storage tank drainage pipe is arranged in the middle of the bottom of the water storage tank and provided with a second electric valve, and the side face of the water storage tank is connected with a water storage tank water inlet pipe through a hose. The low ventilation pavilion has the techn