The work aims to study the effects of wall thickness and aluminum foil on the moisture penetration of GFRP sealed packaging container test samples to obtain the change law of moisture penetration of GFRP sealed packaging container. The test of moisture penetration was carried out in some test station shed, and the test sample was tested in the method of silica gel test. The study showed that the wall thickness of the packaging container had a significant effect on its moisture penetration. The thicker the wall was, the lower the moisture penetration was. The test period had certain effect on the moisture penetration of the test sample. In certain test period, the longer the test period was, the lower the moisture penetration was. At the same time, compared with the test sample of the same wall thickness, the influence of aluminum foil on the moisture penetration of the container was particularly significant. On the basis of analyzing the test results, the moisture penetration test data of test samples of the GFRP sealed packaging container as well as the change trend of influence of wall thickness and aluminum foil on the packaging container moisture penetration are obtained, so as to provide help for the improvement of overall protective performance evaluation system of the military sealed package and the enhancement of weaponry environmental adaptation.