Abstract: With the development and evolution of the fourth industrial revolution represented by digital technologies, building digital power grids based on the in-depth integration of advanced digital technologies is an important path to promote the digitalized transformation of power grid. Focusing on the basic concepts and ideas, this paper introduced the thinking and new features of digital power grid, and presented the technology architecture, including sensor measurement, edge computation, information communication, digital platform, cross-domain intelligence, and system security. Moreover, the challenges and key technical issues of the construction of digital power grid were discussed, and the value system of digital power grid was also prospected. This paper could provide some ideas and references for the development of digital power grid.