The invention discloses an aerodynamic interference measuring method for a helicopter coaxial rigid rotor model, and belongs to the technical field of wind tunnel test. The measuring method is mainlyrelying on a twin rotors wind tunnel test platform, and can be used for conducting the aerodynamic load and aerodynamic interference test of the coaxial rigid rotor model with large forward ratio. According to the measuring method, the aerodynamic load of the upper hub model, the lower hub model, the upper rotor model, the lower rotor model and the different combinations of the four models are respectively measured by the upper and lower rotor measuring systems, and the problem of separately measuring the aerodynamic performance of the upper and lower hub models and the upper and lower rotor models by acquiring the separate aerodynamics of the four models and the aerodynamic interference laws in different combinations. The method can be used for the study of the aerodynamic interference characteristics of twin rotors.