Abstract: Transmission lines are one of the most important components in the power system, However, transmission lines are often subject to interference from various external factors, such as dust screen, kite line, plastic cloth, etc. These foreign substances may cause short circuits, open circuits, fires and other accidents, causing significant losses to society. In order to prevent these accidents from happening, researchers have begun to explore the use of laser technology to remove foreign objects from transmission lines. This paper mainly introduces the working principle, technical characteristics, technical difficulties and development prospects of laser removal of foreign objects on transmission lines.