The utility model relates to an air film building foundation which comprises a plurality of foundation modules. The foundation modules are placed on the ground and connected in an end-to-end manner, and each foundation module comprises a '_'-shaped structure and an 'L'-shaped structure. The foundation modules can be pre-machined in a factory, can be transported to a site and mounted as needed, and only need to be placed on the ground without excessive treatment for the ground, modularization is realized, and the air film building foundation is short in construction cycle, low in building cost and applicable to occasions needing frequent movement or occasions with the original ground or facilities which cannot be modified or damaged.