The phenomenon and characteristics of secondary pitch vibration of eight-bundle conductors are analyzed through numerical analysis, and the numerical simulation results are compared to find the trajectory and movement of each sub-conductor. Similarities and differences in dancing amplitude. The results show that the sub-conductors of the iced eight-bundle transmission line dance in the same direction at different wind speeds, but due to the influence of wake interference and aerodynamic loads, the vibration amplitudes of the sub-conductors are different under different wind speeds, and the vibrations of the sub-conductors are different. The limit of the time history diagram is an oblique ellipse. It can be seen that the secondary pitch vibration during the galloping process of the iced eight-bundle conductor may cause the sub-conductor to collide, which will harm the safe operation of the UHV transmission line. The research results provide a reference for the research of galloping principle and anti-galloping of UHV transmission line.