Abstract:With the rapid development of China"s economy, the demand for electricity continues to grow, and the scale of the power system continues to expand, which puts forward higher requirements for the safe and stable operation of the power system. Substation maintenance, as an important part of power system operation and maintenance, plays a crucial role in ensuring the reliable operation of the power system. This article proposes a new power system substation maintenance strategy based on big data and cloud space technology to address the shortcomings of traditional substation maintenance strategies. By mining and analyzing a large amount of historical data, real-time monitoring and prediction of the operation status of substation equipment can be achieved, thereby improving the pertinence and efficiency of substation maintenance, reducing maintenance costs, and providing strong guarantees for the safe and stable operation of the power system.