Large-size round can foundation steel formwork supporting system and construction method

The invention discloses a large-size round can foundation steel formwork supporting system which comprises a steel formwork, a plurality of supporting columns, a plurality of supporting columns, a plurality of supporting columns, a plurality of supporting columns, a plurality of supporting columns and a plurality of supporting columns. A plurality of stirrups are arranged on the periphery of the steel formwork at intervals in the vertical direction. The supporting devices are arranged along the periphery of the steel formwork at intervals; a plurality of telescopic supporting blocks are arranged on the side, facing the steel formwork, of any supporting device at intervals in the vertical direction, all the telescopic supporting blocks abut against the outer wall of the steel formwork, and a pressure sensor is arranged in the center of the end, facing the steel formwork, of each telescopic supporting block. The supporting force on the steel formwork can be correspondingly adjusted according to the stress of th