In view of the poor consistency of severity and poor comparability of test results in the reliability qualification test of armored vehicles in the field, the severity evaluation index system of reliability test is established by analyzing the influencing factors of armored vehicle reliability. Based on the equivalent damage principle, the reliability accelerated test theory is applied to the severity evaluation of armored vehicle reliability test, and the severity evaluation models of single stress, multi-stress and single stress combination reliability test based on failure physics are established. Through the application example of the reliability test profile of a certain equipment, the relative severity of the reliability test of each stress factor under two test profiles is analyzed, and the quantitative evaluation of the severity of the reliability test of armored vehicles is realized. The results show that the model provides a basis for the design of reliability qualification test profile and the evaluation of test results.