The invention discloses a gas turbine radial air inlet complex distortion digital twinning test device and a control method. An outlet of a radial air inlet chamber of the device is connected with an inlet of an air compressor through a connecting pipeline, the connecting pipeline is coaxially and fixedly connected with an outlet pipeline, the outlet pipeline is connected with an electric valve, an axial flow air compressor is fixedly installed in the outlet pipeline through a connector flange, and a lubricating oil mist generating device is installed on the connecting pipeline. The performance sensors are installed on the radial air inlet chamber, the connecting pipeline, the outlet pipeline and the axial flow air compressor respectively, the performance sensors are all connected with the data collecting and storing system, and the air inlet distortion digital twinborn control middle table is connected with the other modules. According to the control method, an actual digital twinning performance model is obtained, and a driving mechanism is used for controlling a flow field of a radial air inlet system of the gas turbine. According to the method, high-precision design and optimization of air inlet distortion of the radial air inlet chamber of the gas turbine are carried out, control oscillation is reduced, and low-delay control and high-reliability safe operation of stall surge characteristics are guaranteed.