The invention discloses a steam turbine valve flow characteristic identification method and system based on a T-S fuzzy model and a medium. The steam turbine valve flow characteristic identification method based on the T-S fuzzy model comprises the steps: calculating and obtaining a regulating stage pressure estimation value corresponding to a steam turbine comprehensive valve position instructionwhen main steam pressure maintains a rated value; and inputting an input vector composed of the turbine comprehensive valve position instruction, the main steam pressure rated value and the regulating stage pressure estimated value into a preset T-S fuzzy model to obtain the actual steam inlet flow of the turbine, thereby obtaining the corresponding relation between the turbine comprehensive valve position instruction and the actual steam inlet flow under the working condition. According to the steam turbine valve flow characteristic identification method, the valve flow characteristics of the steam turbine are identified by adopting the T-S fuzzy model, and a steam turbine valve flow characteristic test is not needed, and manpower and material resources are saved, and the workload is greatly reduced, and adverse effects of a conventional test method on safe and stable operation of a unit are avoided.