The biplane expansion box also has the characteristics of flexible mobility, energy conservation and environmental protection, and relatively low construction and dismantling costs. It is not only widely used in enterprise offices, temporary activities, construction sites, and other aspects to improve living conditions and ensure a comfortable and safe working environment for users, but also suitable for short-term temporary accommodation needs, such as natural disaster relief, and can be used for long-term residence, such as tourist camps, small communities, etc.