The safety of transmission lines is very important to the stable operation of power grid.However,the traditional monitoring methods have gradually failed to meet the needs of modern power systems because of their low efficiency and high energy consumption.Aiming at the possible abnormal vibration around the transmission line,an intelligent monitoring system for preventing external damage of transmission lines is designed and implemented.Firstly,the system structure is analyzed in detail.Secondly,the specific design of the system is studied,including the hardware design and embedded software design of the monitoring device,the software design of the upper computer and the server design.Finally,the system is implemented and tested.Through this research,the purpose is to improve the safe operation level of power grid and provide a new solution for the prevention of external damage of transmission lines.