The utility model discloses a gas turbine blocking device. The gas turbine blocking device comprises an electromagnetic assembly and a transition plate assembly, wherein the electromagnetic assembly comprises a solenoid valve, a bolt, a valve core and a spring; the solenoid valve is connected to the bolt; the bolt is fixed on the valve core; one end of the spring is fixed on the lower end of the bolt; the transition plate assembly comprises a transition plate, an oil inlet pipeline, an oil outlet pipeline and a vertical pipeline; the oil inlet pipeline, the oil outlet pipeline and the vertical pipeline are arranged in the transition plate; the oil inlet pipeline is connected with the vertical pipeline; the vertical pipeline is connected with the oil outlet pipeline; the bolt, the valve core and the spring are mounted in the vertical pipeline. According to the gas turbine blocking device, a pilot hole is omitted; the processing process is simplified; the influence of oil liquid impurities on the valve is avoided, so that the failure rate and the manufacture cost are reduced; due to the adoption of directly-driven control, the valve is controlled to be opened and closed by only using electromagnetic force; blocked oil pressure is built.