Pneumatic water retaining gate dam

The invention relates to the technical field of hydraulic engineering, in particular to a pneumatic water retaining gate dam, which is characterized in that a rubber air bag buoy is inflated through an inflating device, the upper end surface of the rubber air bag buoy rises gradually in the inflating process, and a pneumatic lifting support rod on the rubber air bag buoy rises along with the rubber air bag buoy, so that a gate dam plate is jacked up; the function of lifting the gate dam plate is realized; when the gate dam plate is supported to be in a lifting state to stop water, direct impact of water flow, sand, icicle and the like on the rubber air bag floating barrels and the pneumatic floating wharf can be avoided, and the situation that the gate dam plate and the dam bottom directly press the inflatable air bags is also avoided. The maximum height of the gate dam plates in the rising state can be limited through the limiting belts, when the limiting belts are arranged below the multiple gate dam plates