Abstract: On June 17, 2020, a debris flow occurred in Meilong Gully, Danba County, Sichuan Province, which awaked the ancient landslide in Aniang village. Two 500 kV ultra-high voltage transmission towers on the ancient landslide collapsed via continuous deformation of the landslide after more than two months. This paper collects twelve multi-period data of domestic and foreign high-resolution optical satellite remote sensing images in this area. The horizontal and vertical displacement changing results of the tower foundation during the landslide movement are extracted. Also, the process of tower collapse is analyzed to evaluate the force of the double tower. The research results evidently show that high-resolution satellite remote sensing data plays an irreplaceable role in the process of the accurate assessment about the disaster situation of transmission towers. It not only provides a significant reference for power grid rescue and disaster relief, but also can be used for artificial interpretation and risk assessment of ancient landslides in transmission line corridors areas.