Unmanned underwater vehicle (UUV) might not execute the missions or get lost or even be destroyed due to the thruster faults, while operating in the complex and changeful sea environments. To enhance the safety assurance ability of UUVs, the geometric-correlation-based method is adopted to analyze the fault location (FL) problem for multiple thrusters. FL algorithm together with the constraint conditions for FL is designed for the thrusters in the same surface. Simulation experiment is utilized to verify the effectiveness of the proposed algorithm.