The invention discloses steam turbine generator unit fault visual diagnosis method and system. The method comprises the steps: acquiring operation parameters and vibration data of the steam turbine generator unit; obtaining a reference vibration vector of the steam turbine generator unit under all working conditions according to the operation parameters and the vibration data; acquiring a real-time vibration vector of the steam turbine generator unit under all working conditions; comparing the real-time vibration vector with a reference vibration vector to obtain a vibration vector differencevalue; and carrying out fault determination on the steam turbine generator unit according to the vibration vector difference value. By adopting the method or the system provided by the invention, faults can be judged in time, and the risk of serious accidents of the unit is reduced.