High-airtightness building structure

The utility model discloses a high air tightness building structure, including wall structure and floor support plate, the floor support plate is provided on the top of the wall structure, the wall structure includes curtain wall, steel beam, thermal insulation wall, pressure plate and waterproof seal assembly, the curtain wall is provided on the outer side of thermal insulation wall, the steel beam is provided on the top of thermal insulation wall, the pressure plate is provided on the pressure plate, and the waterproof seal assembly is provided on the pressure plate. A plurality of pressure plates are laid on one side of the steel beam and the inner side of the heat preservation wall body, and waterproof sealing assemblies are arranged at the connecting seam of the wall body structure and the connecting position of the wall body structure and the floor support plate. By means of the structure, the airtight layers can be continuously communicated, the overall airtightness is guaranteed, air leakage of the bu