In order to realize the rapid rescue and improve the rescue success rate, a new triple-hulled rescue device is designed according to the multi-hulled ship concept. It is a bridge-connected triple-hulled rescue device including a front hull, a side hull and a connecting bridge. Under the condition of fast rescue, the overall design of the new triple-hulled rescue device is determined with the optimal resistance performance as the index. The overall design idea of the new triple-hulled rescue device is mainly to realize the fast rescue, that is, it should meet the requirements of both performance and layout, the performance should meet the rapidity and stability, and the layout should be reasonable. The Computational Fluid Dynamics (CFD) simulation method is used to calculate the device resistance, and Renormalization Group (RNG) k-ε is selected as the turbulence model in the numerical analysis. The results show that the arrangement position of internal components and the counterweight weight and its arrangement position possess a great influence on the device resistance. Two design schemes are given, and the design of scheme 2 is the best after comparing.