Aiming at the defect in design of autonomous underwater vehicle ( AUV) that it does not support the collaborative design currently，we construct a B/S mode-based collaborative design platform for AUV. The functions and structures of the platform are introduced in the paper，the key techniques to realize the platform are discussed in detail. The XML files are used to realize the information storage of complex structure design flow. The mobile Agent technology is adopted to realize the scheduling and execution of computing tasks，and the implementation scheme of mobile Agents based on Aglet platform is presented as well. The collaborative design platform can support the collaborative design for multiple designers in different places and the parallel execution of multiple design flows. Thus，it can improve the efficiency of AUV design.