Air shield dam, also known as pneumatic steel shield rubber dam, is a new type of water retaining structure that combines the advantages of rubber dam and steel gate, with a balance of rigidity and flexibility. Its structure mainly consists of shield plate, inflatable airbag, and control system. Using inflatable airbags to support the shield plate to block water, the airbag will collapse after venting, and the airbag will lie under the shield plate to avoid damage to the dam bag caused by river sand, gravel, ice, and other debris; The filling medium inside the airbag is gas, causing rapid collapse of the dam: all components are prefabricated, with a short installation period; Modular shield and airbag for easy repair.