Aiming at the problem that the emergency treatment of high voltage power transmission line equipment failure is cumbersome, inefficient, and time-consuming, an Android mobile location and navigation system for equipment failure of power tower is designed. The overall architecture of the system and the client software structure are introduced firstly. Then this study focuses on the main interface design and the design of function modules, including loading power tower equipment module, fault location module, navigation module, information query module, and coordinate update module. By using the information of fault equipment, the system can accurately and quickly locate the position of power transmission line equipment failure. Furthermore, the system can directly navigate to the equipment failure of power transmission line and attain the information of faulty devices. As a result, it greatly reduces the finding time of equipment failure, also improves the speed and efficiency of emergency responsibility. So that it can save valuable time for the rapid recovery of power supply with strong practical significance.