The invention discloses a reusable membrane-foundation connecting joint of a modular building. The reusable membrane-foundation connecting joint comprises a membrane structure surface layer, a foundation and angle steel arranged on the connecting position of the membrane structure surface layer and the foundation. When tensioned in place, the membrane structure surface layer is fixed to one leg ofthe angle steel through first bolts, and the other leg of the angle steel is fixed to the foundation through a second bolt. Gaskets are arranged on the connecting position of the membrane structure surface layer and the angle steel. According to the reusable membrane-foundation connecting joint, the structure is simple, processing and mounting are convenient, force transmission is clear and reliable, and standardization and productization of the modular building are achieved; the use safety can be guaranteed, recycling can also be achieved, materials are saved, and the construction period ofreconstruction on another place is shortened; a joint area is sealed, energy consumption of the building is effectively reduced, and the environment-friendly building effect is achieved; and the reusable membrane-foundation connecting joint is suitable for different use environments and can be applied and popularized worldwide, and the good social and economic benefits are obtained.