Building method for three-dimensional garage

The invention discloses a building method for a three-dimensional garage. The building method comprises the following steps: (1) building a bottom-layer parking garage with a plurality of parking spaces; (2) building a middle-layer parking garage with a plurality of parking spaces; (3) building a top-layer parking garage with a plurality of parking spaces. According to the building method for the three-dimensional garage, the parking garage at each layer is built sequentially, the construction speed for field building is high, time needed for building is short, and more parking spaces are arranged on a limited floor space for parking vehicles; the three-dimensional garbage formed by building is high in strength, is good in stability, is strong in load-bearing capacity and is more reasonable in stress; inner and outer supporting frames, connecting assemblies and longitudinal beams of the parking garage at each layer are in fastening connection through fasteners and are convenient to dismount, so that the three-dimensional garage can be dismounted for moving or re-building after a place is replaced.