The popularity of educational informatization and the emergence of smart learning spaces have significantly increased students' demand for personalized, convenient, and diversified learning content. The fifth generation mobile communication (5G) technology, with its characteristics of large bandwidth, ultra-high reliability, ultra-low time delay, large-scale connection of things, is becoming an enabling technology for perfecting the education network and even realizing education modernization. This paper focuses on the application of 5G technology in education informatization. After the analysis of major characteristics of education informatization, this paper analyzes the technical challenges faced by the education network of China, and demonstrates corresponding 5G application scenarios from the aspects of teaching, teaching research, and education management, thereby forming an overall view of education informatization based on 5G technology. By 2035, the 5G technology will be further promoted, which will constantly enrich the connotation and promote the reform of education scenes; and thus it will become the driving force for the innovation in China's education informatization.