The invention discloses a fabricated urban-road upper-space intelligent three-dimensional parking system and method. The fabricated urban-road upper-space intelligent three-dimensional parking system comprises at least one layer of midair parking lot arranged above the motor vehicle road, a fabricated parking lot supporting structure used for building and supporting the midair parking lot, perpendicular lifting platform systems and / or vehicle getting-in and getting-out systems which are used for allowing vehicles to getting in or out of the midair parking lot. The fabricated parking lot supporting structure comprises support bases, support stand columns and at least one layer of support beam. Support stand columns are provided with vertical fabricated butt-jointing connecting structures and horizontal fabricated butt-jointing connecting structures which are fixedly connected with support bases in a butt-jointing mode. A ground intelligent lifting rod can identify vehicle information and vehicle arriving time, then control a vertical lifting platform to decline, provide available parking space information for every layer of midair parking lot, and send the information to drivers, and the drivers can leave after paying; fabricated construction is adopted, and quick assembly can be achieved under the condition that the traffic is not influenced; and quick construction can be achieved on the basis without influencing original road system functions.