Thunderclouds often cause multiple lightning strikes when discharging to the ground. Several accidents have occurred in 220 kV and 110 kV substations in coastal areas with strong lightning activity, such as Guangdong, Guangxi, Zhejiang, and Jiangsu. Lightning intrusion waves have caused damage to equipment such as outgoing line interval circuit breakers, lightning arresters, and insulators in substations. Although lightning protection measures have been taken, there are still loopholes and shortcomings. Multiple lightning intrusions cause circuit breaker breakage, circuit breaker outer porcelain sleeve flashover, GIS equipment faults, lightning arrester faults, and even explosions, which continue to occur and increase, seriously endangering personal, power grid, and equipment safety. To prevent similar accidents from happening again, this article comprehensively analyzes the characteristics of lightning intrusion waves during multiple lightning strikes. In order to collect high-frequency signals of lightning intrusion wave overvoltage and current in substations, fully and accurately record and display the characteristics of lightning overvoltage and current, it is necessary to develop a lightning monitoring device. Based on the analysis results of lightning intrusion wave characteristics mentioned above, this article provides the technical requirements for the monitoring device. The research results can provide basic data support for the countermeasures and standardization of multiple lightning accidents in substations.