Externally-hung operation steel platform and construction method thereof

The invention provides an externally-hung operation steel platform and a construction method thereof. The externally-hung operation steel platform is used for constructing a middle overhanging prefabricated wall located between two prefabricated side walls. The steel platform adopts a square frame with the U-shaped cross section, wherein the two sides of the square frame are correspondingly hung on the prefabricated side walls, the top of the square frame comprises a long main hanging longitudinal beam and two short main hanging longitudinal beams, each short main hanging longitudinal beam isconnected with the long main hanging longitudinal beam through two transverse connecting rods, the transverse connecting rods on the outer sides are used for connecting the long main hanging longitudinal beam and the short main hanging longitudinal beams, then the long main hanging longitudinal beam and the short main hanging longitudinal beams are enabled to extend outwards correspondingly, the length of the outward exte