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Aiming at the current situation that the application environment of wind tunnel balances is becoming increasingly complex, but there is no effective safety monitoring methods, a real-time load monitoring method for wind tunnel balances based on the principle of stress superposition is proposed. Firstly, analyze the stress situation of the balance, and divide the hazardous load monitoring area based on factors such as engineering experience, balance stress concentration location, and strain gauge attachment location. Secondly, based on the finite element method, the balance is meshed to calculate the stress impact coefficient of the grid nodes in the load monitoring area. Finally, the node stress value in the load monitoring area is calculated in real time based on the six element signal output of the balance, and compared with the finite element theoretical calculation results and static calibration loading results. The verification results show that the accuracy of the finite element theory verification is better than 0.02%, the accuracy of the static calibration loading verification resistance element is better than 10%, and the accuracy of the remaining 5 elements is better than 4%. It has been proved that this method has a high computational accuracy, can meet the use requirements of real-time load monitoring of wind tunnel balances, and has high practical application value.