The invention provides an elastic aerodynamic data accurate acquisition method based on an engineering panel method. The method includes the following steps: 1. establishing a wind tunnel model and areal model of an aircraft; 2. carrying out aeroelastic performance evaluation for the wind tunnel model and the real model, and proceeding to a step 3 when elastic aerodynamic data based on the wind tunnel model and the real model is determined to need to be corrected; 3. carrying out a step of first elastic correction, namely a step of using a wind tunnel test to measure an aerodynamic coefficient of the wind tunnel model, calculating aerodynamic coefficient change amount of the wind tunnel model before and after deformation by using the engineering panel method and subtracting wind tunnel deformation data from the aerodynamic coefficient change amount to obtain first aerodynamic data; and 4. carrying out a step of second elastic correction, namely a step of calculating aerodynamic coefficient change amount of the real model before and after deformation by using the engineering panel method and superimposing the calculating aerodynamic coefficient change amount with the first aerodynamic data. According to the invention, the two-step elastic aerodynamic data accurate acquisition method is established, and the accuracy of the obtained flight elastic aerodynamic data is greatly improved.