The invention discloses a wind tunnel compressor rotor overturning tool which comprises a bottom assembly, a base and a top assembly. The wind tunnel compressor rotor overturning tool is characterizedin that an air-inlet-side shaft of the wind tunnel compressor rotor is rotatably connected with the base through a bottom assembly; the air-outlet-side shaft of the wind tunnel compressor rotor is fixedly connected with a top assembly; the top assembly is separately connected with a crane; and the top assembly is moved through the crane so that the wind tunnel compressor rotor in an assembling process can be overturned between a horizontal state and a vertical state around the base. The wind tunnel compressor rotor overturning tool has advantages of making the wind tunnel compressor rotor satisfy assembling requirements in different states, reducing assembly difficulty and improving assembling efficiency.