Steam turbine control method for shortening starting time of unit

The invention relates to a steam turbine control method for shortening unit starting time, which comprises the following steps of: S1, acquiring an improved temperature X criterion, and starting a steam turbine; s2, whether the steam turbine meets the X1 criterion and the X2 criterion in the temperature X criterion or not is judged; s4, whether the steam turbine meets X4, X5 and X6 criteria in the temperature X criteria or not is judged; s5, after low-speed warm-up is conducted to the second rotating speed, the opening degree of an ultrahigh-pressure cylinder and the opening degree of a high-pressure cylinder of the steam turbine are controlled to be reduced, and the opening degree of an intermediate-pressure cylinder is controlled to be increased; s6, whether the steam turbine meets the X7 criterion in the temperature X criterion or not is judged; and S7, whether the steam turbine meets the X8 criterion in the temperature X criterion or not is judged, if yes, grid connection of the steam turbine is conducted