Folding mega door door is a flexible soft curtain door with two layers of door fabric inside and outside. The door fabric is connected by aluminum crossbeams, vertically lifted, and equipped with movable guide rails. It is particularly suitable for large factories and hangars with layered top beams that are not in the same straight line. The flexible lifting gate (stacked machine warehouse door) is installed inside the opening and does not occupy indoor or outdoor space. When opening, the door cloth moves first, and finally overlaps above the opening. Then, the movable guide rail turns and rises to park below the door cloth. When closing, the movable guide rail is first lowered, and then the door cloth is lowered until it is completely closed. form Door frame, guide rail (movable guide rail), door cloth, aluminum crossbeam, top frame frame frame, bottom crossbeam, sealing system, drive and transmission system, electrical control system and installation device, etc. characteristic: Light weight, small footprint, reasonable layout, high wind resistance, high tensile strength High security