Abstract: Sealing properties of aircraft integral fuel tank structure is crucial for ensuring aircraft safety. Therefore, it is necessary to conduct a comprehensive study on the sealing safety of integral fuel tanks. According to the force characteristics of the overall tank structure in the aircraft, a novel aluminum alloy simulator specifically tailored for integral fuel tanks was designed. Through static and failure tests, the performance of the aircraft’s integral fuel tank simulator and the reason for seal failures were analyzed. Additionally, the finite element software was employed to simulate the failure tests of the fuel tank simulation component. By compared simulation results with actual test results, the seal failure process of the test was analyzed.The results show that the sealing property of the integral fuel tank can be guaranteed before the damage of integral fuel tank structure.