The invention discloses a power transmission line repair flying vehicle, belonging to high-voltage power transmission and transformation repair tools. The traditional repair flying vehicle has the problems that a brake mechanism is complex and pulleys are easy to crush the hands of repair personnel in the sliding process of the flying vehicle. The power transmission line repair flying vehicle comprises two vehicle frames formed from two mutually connected pillars, one pulley is arranged respectively on each pillar, a brake device is arranged on each pulley, each brake device comprises a protective cover covering each pulley, the one end of the bottom of each protective cover transversely extends to form an extension part, and a brake piece is arranged below each extension part. The protective covers with the brake pieces additionally arranged on the pulleys of the flying vehicle not only can play the effect of braking the flying vehicle, but also can prevent the pulleys from crushing the hands of the repair personnel during sliding. The power transmission line repair flying vehicle is simple in structure, easy to operate and low in cost and can be applicable to all repair flying vehicles with pulleys.