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Aiming at the problems of strong subjectivity and clear boundary of comment level in the performance evaluation of armored vehicle PHM system, the evaluation method combining subjective and objective combination weighting and improved extension cloud theory is adopted to enhance the objectivity and accuracy of the evaluation results; Firstly, the composition and performance evaluation index system of armored vehicle PHM system are introduced, then the index weight coefficient is determined by the combined weighting method based on "AHP entropy", and the cloud correlation value of each index is determined by the improved extension cloud theory based on optimal cloud entropy. Finally, the performance of four sets of armored vehicle PHM system is calculated by fuzzy comprehensive evaluation method. The results show that the improved evaluation method can effectively overcome the subjectivity of evaluation and the clear boundary of evaluation level without losing accuracy, which provides a reference for the optimization of PHM system performance of armored vehicles.