Different types of equipments are installed in the warship cabins according to their functions. However, present research of cabin internal blast damage mainly focuses on the effects of damage elements on vacant cabin, and the effects of the equipments installed in the cabin are seldomly considered. By using the finite element software LS-DYNA, three types of rib-reinforced cabin models, including the one installed with no equipment, the one with one equipment, and the one with two equipments, were built. The analysis of the damage of cabin structure and equipments caused by the internal blast of warhead charge and the comparative analysis of the influence of equipments on the damage effect were conducted. The comparative analysis results show that, because of the obstruction of the equipments, different arrangements of equipments affect the internal flow field distribution of shock waves in a cabin and convergence of shock waves in corners, reduce the maximum overpressure value and change its location, which finally lead to the change of the cabin structure′s damage process .