Inflatable membrane structure is a new type of building made of membrane materials, which originated in the early 20th century and has been used in industry, agriculture, commerce, environmental protection and many other fields. It is a building made of membrane materials, which uses the internal pressure formed by air supply to make the membrane produce tension, while maintaining the spatial stability and structural integrity of the structure. The basic components include membrane structure system, air supply device, air circulation control access and emergency exit and appropriate anchoring system. This paper mainly introduces the air supply device of inflatable membrane structure in detail.