Abstract: To solve the problem of incomplete protection in power system security protection, a power system security protection method based on edge node technology was designed. Firstly, based on the edge node technology, the edge multi-access computing model was established to implement data migration for the power system and realize distributed data deployment. Secondly, the data transmission encryption algorithm was designed. And based on the GCForest, the power system network intrusion detection model, which was composed of a sample input layer, multi-granularity scanning layer, and training layer, was established to implement system intrusion detection. The test results show that the average service delay of the proposed method is only 456.32ms, the network robustness has no significant fluctuations, and the maximum false detection rate and missed detection rate of intrusion detection are 0.13% and 0.14%, respectively.