The invention discloses a gas turbine control system semi-physical simulation test device and a verification method. The gas turbine control system semi-physical simulation test device and the verification method can solve technology problems that the gas turbine controls system performance verification under an extreme working condition and the gas turbine controls the system performance assessment under a full working condition. Particularly, the gas turbine control system semi-physical simulation test device and the verification method are applied to performance assessment and test verification of the ground gas turbine control system under the extreme condition or the full working condition. The gas turbine control system semi-physical simulation test device comprises an oil tank, a plunger pump, a high pressure essential oil filter, a fuel oil metering valve, a fuel oil flowmeter, a parking solenoid valve, a pressure regulation valve, an electromagnetic reversing valve, an actuator cylinder, a gas turbine controller, an upper computer, a state monitoring display device, an Ng small inertial speed changing motor, an Ng phonic wheel speed testing mechanism, an Ng vector motor control device, a simulation excitation unit, an Np small inertial speed changing motor, an Np phonic wheel speed testing mechanism, an Np vector motor control device, etc. The semi-physical simulation test device and verification method have a wide application value in aspects of test verification and performance assessment of a digital control system of a power device.