Abstract: This paper develops a robot intelligent inspection system for substations, and presents the design scheme and key technologies of the inspection system in terms of the robot body, charging system, wireless transmission system, local monitoring background and the environment adaptability. An introduction is made to the engineering implementation steps of the system in terms of site investigation, equipment installation, and inspection planning and application, and its practical applications in 220 kV and 500 kV substations. At the same time, the paper also presents the problems in the process of robot inspection and debugging, such as the derailment during travelling, unstable wireless communication, inaccurate meter reading, and difficult turning around the corner, and proposes corresponding solutions. With such significant advantages as quick deployment, strong adaptability, accurate data collection, high positioning accuracy, and ultrasonic anti-collision, this system can meet the requirements of substation intelligent inspection in all functions and has good application prospects.