With the development of the times and the rise of emerging technologies, drone technology has been widely used in the field of transmission line inspection. The application of drone technology has greatly reduced the labor cost and at the same time guaranteed personal safety, which is the general trend of social development. This paper first introduces the technology of UAV, and then starts from the application of UAV technology in the field of transmission line inspection as well as its advantages and disadvantages, and gives a specific overview of the application of UAV in the field of transmission line inspection.