The invention relates to a live-line lead inspection UAV. The UAV comprises a rotorplane body, the external surface of the rotorplane body is coated with a PRTV anti-pollution-flashover coating, and a flight control chip of a rotorplane is coated with an insulating resin slurry; and a walking device which moves on a high-altitude lead is arranged under rotor poles of the rotorplane, and comprises slide rail covers arranged symmetrically, each slide rail cover is connected to the rotor poles via connecting rods, a bracing frame is fixed horizontally in the slide rail cover, the front end of the bracing is provided with a driving synchronizing wheel, the rear end of the bracing frame is provided with a driven synchronizing wheel, the driving synchronizing wheel and the driven synchronizing wheel are provided with a synchronizing conveyer belt, support rollers are arranged on and under the bracing frame, the driving synchronizing wheel is driven by a walking motor fixed in the slide rail cover, the walking motor is electrically connected with a synchronous walking controller on the slide rail cover in the same side, and the synchronous walking controller is controlled by a ground remote controller. The live-line lead inspection UAV is insulated integrally, the rotor walks by itself on the lead, and an omnibearing camera can inspect the lead condition accurately.