An overhead power line inspection robot system. It includes an online execution system, a vehicle-mounted portable base station and a ground data management center. The online execution system includes: an n-type suspension box, a camera, a roller, a protective telescopic shaft and a control driving device; The vehicle-mounted portable base station includes a remote remote controller and a portable video terminal; The ground data management center includes a server and a display. The use effect of the overhead power line inspection robot system provided by the invention: real-time video communication, shooting with all-round multi-angle capability, can accurately detect transmission line corrosion, broken shares, damage and other problems. With autonomous and remote control dual working mode. Self-provided batteries and power storage can complete 5 kilometers of line travel. Smooth operation with 15 degree grade climbing ability. Reliably cross the anti-vibration hammer and tower on the line. With self-locking ability to prevent accidental fall.