Method for evaluating uncertainty of measured value of aerodynamic balance in wind tunnel test

The invention discloses a method for evaluating uncertainty of a measured value of an aerodynamic balance in a wind tunnel test, and relates to the field of wind tunnel tests of aerospace crafts. A repeatability test is carried out by selecting a certain state of an aircraft aerodynamic characteristic wind tunnel test, a comprehensive uncertainty result of a balance measured value in the test state is obtained, and an uncertainty synthesis mathematical model including the influence of the balance measured value uncertainty, the model attitude angle uncertainty and the flow field uncertainty is constructed. The uncertainty values are used as necessary input conditions and are expanded and applied to balance measured value comprehensive uncertainty calculation when a flow field of a test or a model state is changed; and a foundation is laid for solving aerodynamic uncertainty evaluation results of all test states of an aircraft aerodynamic database test. The method is based on a single-state repeatability test