Abstract: 5G non-terrestrial network (NTN) is the most advanced satellite-terrestrial and air-space integrated communication technology, and is an important technology for terrestrial 5G communication systems for new application scenarios such as satellite communication and low-altitude communication. It is of great significance to study the key technologies and applications of 5G NTN for the construction of a digital, intelligent and strong power grid. On the basis of in-depth exposition of the situation and challenges faced by a new type of power system, this paper deeply analyzes the key technical characteristics and application scenarios of 5G NTN, combines the current communication requirements of a new type of power system's service blind zone, proposes an application architecture of power 5G NTN technology, builds a satellite-terrestrial integrated communication system for power services, and gives the application test results of the satellite-terrestrial integrated communication system in the power industry, and finally looks forward to the evolution and development trend of power air-space-earth integration technology. The deep coupling of 5G NTN technology with the power grid empowers the construction of a new type of power system, provides a strong air-space integrated communication guarantee for power multi-service carrying and information interaction, and lays the foundation for the construction of a power integrated communication network of air, space, and earth.