Abstract: Aiming at the system security problems and potential risks existed in the navigation and positioning algorithm of test and inspection robot in power grid,a multi-source fusion robust positioning and high-fidelity simulation method for inspection robots is proposed. Firstly,based on unreal engine,a smart grid simulation platform is built which is suitable for navigation and positioning algorithm testing. Secondly,a robust multi-source fusion navigation algorithm based on the principle of consistency detection module is designed. Finally,simulation experiments prove the effectiveness of smart grid simulation platform and robust multi-source navigation algorithm,which lays a foundation for subsequent research.