The utility model relates to a high-quality three-dimensional steel-made parking garage main body which is rapidly assembled by several steel member blocks (boxes). The design of the parking garage main body is enlightened by the construction concept of the National Stadium 'Bird' Nest'. The construction period of the parking garage main body is shortened compared with that of the parking garage main body made from reinforced concrete. The single-layer structure of the three-dimensional parking garage main body is a part of the three-dimensional parking garage main body, and is formed of garage walls (1), partition plates (2), upright posts (3) and a bottom plate (4) by welding. Ten cars can park inside the single-layer structure of the three-dimensional parking garage main body. The three-dimensional steel-made parking garage can be rapidly assembled and brought into use by rapidly superimposing a plurality of the single-layer structures of the three-dimensional parking garage main body and assembling with a garage bottom and a garage top with large-sized lifting equipment, and equipping auxiliary facilities for the garage, such as a transmission system, a power system and a control system.