Communication, as an important means of interpersonal communication in our daily life, is developing towards the direction of modernization and diversification. In order to meet with the needs of the development of science and technology network, our country has carried out a comprehensive mobile communication technology reform, and one of the main reform directions is 5G mobile communication. In this paper, the development trend and key technologies of 5G mobile communication are discussed and analyzed. It is pointed out that the further improvement and development of 5G mobile communication can improve the communication ability of mass sensing devices and M2M.