In this study, benzimidazole and Zn2+ are deposited on the surface of AP particles through chemical precipitation to improve its thermal properties, energy properties and hygroscopicity. The results show that compared with pure AP, the HTD peak temperature and apparent activation energy of the AP@ZIF-7 (25 wt%) sample are reduced by 98.49 °C and 117.62 kJ·mol−1, respectively. The heat release during thermal decomposition increases by 1133.62 J·g−1. In addition, the contact angle between AP@ZIF-7 (25 wt%) and water is 79.19°, which is 66.09° higher than that of AP. At the same time, after being placed at a relative humidity of 88% for 72 h, its moisture absorption rate drops to 0.05 wt%, a decrease of 0.266 wt%. Moreover, compared with the propellant prepared with AP as oxidant, the burning rate of the propellant containing AP@ZIF-7 (25 wt%) increases by 5.28 mm·s-1, and the flame temperature increases by 873.17 °C.