A flat pack container is composed of structural, ground, wall, and roof systems. The basic unit of the pack container is the container body, and its structure utilizes special cold-formed galvanized steel components. The insulation materials for the enclosure are all non-flammable. Water, electricity, and supporting functions are all prefabricated in the factory, eliminating the need for secondary construction. It can be assembled on-site or lifted as a whole into position for immediate occupancy. Additionally, it can be used individually or flexibly combined to create spacious and layered usage spaces.