In view of the disadvantages of manual monitoring the state of grounding wire in catenary maintenance operation, an intelligent monitoring system for grounding wire in catenary maintenance operation based on long range (LoRa) technology is designed. The overall structure of the intelligent monitoring system is designed through the monitoring layer, the transmission layer, the control layer and the application layer, and the hardware structure of the system is designed through the grounding monitoring module, the LoRa wireless communication module and the ARM control chip under the structure; The freedom degree of that line is utilize to judge the galloping amplitude of the line, the current condition in the ground wire is judged according to the current-carrying capacity of the line, whether the current condition meet the safe operation condition of the hooking line is checked according to the judgment result, and the monitoring data is transmitted to a system application layer dispatching center and a handheld terminal of a maintainer through a LoRa wireless communication module. The experimental results show that the system can accurately monitor the state of the ground wire, and has good long-distance transmission performance.