Abstract: To overcome the limitations of the traditional inspection, a kind of joint inspection technology for substation devices based on high-definition cameras, inspection robots and unmanned aerial vehicles (UAVs) is proposed, along with a set of evaluation indicators for joint inspection. Moreover, the key points of the implementation of high-definition camera inspection, indoor and outdoor robot inspection and UAV inspection are analyzed respectively and a coordination mechanism of different inspection methods is established. Finally, the practice of joint inspection for circuit breakers in a 500 kV substation in Jiangsu Grid verifies the feasibility and efficiency of the proposed method.