With the deep integration and development of smart grid and "Internet +" technology, the application of the internet of things technology in the construction of smart grids has become a research hotspot in recent years. Firstly, the concept of internet of things technology is introduced and the internet of things technology is summarized in the applications of three aspects in power system. The key technical characteristics and development trends of the internet of things are analyzed from three aspects:sensor, communication and cloud/edge computing. Then the advantages and application prospects of future internet of things technology in smart grid data acquisition, communication and computational processing are proposed. Finally, from the perspective of the deep integration of internet of things technology and smart grid, the prospect of smart grid is proposed. This work is supported by Natural Science Foundation of Guangdong Province (No. 2017A030313304).