The invention relates to a construction method for an integrally lifted and supported steel platform structure in a high-rise suspended structure. The construction method mainly comprises the following steps: surveying and setting out; pre-burning U-shaped reinforcing steel bars; laying a telescoping main girder; welding transverse auxiliary girders; mounting cable-stayed steel wire ropes; conducting high-formwork erecting above a platform; forming the high-rise suspended structure through pouring; dismounting templates and scaffoldings after concrete curing; mounting platform lifting ropes, and retracting a steel platform; and lifting the steel platform, and transferring the scaffoldings to the next working face in batches. The construction method has the advantage that when the stability of the formwork erecting platform is ensured, the integral lifting of the steel platform and the quick transferring of a scaffolding system can be realized.