Steam turbine false shaft, lightweight, high overall dimensional accuracy, good smoothness, with deflection values marked at fixed intervals, and intuitive measurement data. It can replace the steam turbine rotor to complete center calibration and clearance adjustment in the high, medium, and low pressure cylinders of the steam turbine, reduce the number of times the steam turbine rotor is lifted into the cylinder, and reduce the risk of multiple lifts of the steam turbine rotor into the cylinder. The high-precision steam turbine false shaft is equipped with a dedicated handwheel for manual turning, which is easy and flexible. It is also equipped with a dedicated false shaft lifting and storage seat, which facilitates the on-site movement and storage of the false shaft.