Introduction  Digital power grid is a brand new concept and the best bearing mode of new power system. In the digital transformation, power grid enterprises are committed to constucting a digital power grid. Digital power grid is different from traditional smart power grid. It is necessary to measure the development level of digital power grid from a macro perspective. Therefore, it is necessary to build a new digital power grid comprehensive index to guide power grid enterprises to construct the digital power grid, and analyze the shortcomings in the construction.

  Method  Based on the analysis of the key components of digital power grid development index, a digital power grid index evaluation system was established to select the core indicators of digital power grid. First, the key indicators at all levels were weighted, and then a digital power grid development index model was constructed based on fuzzy theory.

  Result  Three power grid companies subordinate to China Southern Power Grid are selected for case study. The analysis results show that the overall development index of digital power grid is not high, and there is broad development space in various fields other than ontology security index.

  Conclusion  Based on this method, the development status and future development trend of digital power grid of power grid enterprises can be effectively estimated.