In recent years, the application of power distribution automation technology has made great progress, and coverage has been continuously expanded. However, advanced automation technologies such as intelligent distributed feeder automation are still restricted by optical fiber communication. 5G communication technology has the characteristics of more safety and reliability, high speed, low latency, wide coverage, and massive connections. These provide new ideas for the development of distribution automation. In this paper, the application of 5G communication technology to intelligent distributed distribution automation is demonstrated in detail, and an experimental platform is built to verify the communication delay, action response time and stability of automated terminals under 5G communication conditions. The feeder automation is compared and analyzed, and the rapid processing process of the distribution network fault has been upgraded from the minute level to the millisecond level. This offers a very broad application prospect. This work is supported by Shandong Provincial Key Research and Development Program "Research on the Method of Beam Tracking and Multiplexing based on Codebook in Millimeter Wave Wireless Communication" (No. 2019GGX101015).