With the continuous advancement of the power system reform, the emerging business investment in the power grid is gradually rising. How to evaluate it effectively is directly related to the income of the power grid investment. Based on the value of network system, the screen grid emerging business investment value quantification factors indicators, using the G1 -entropy weight synthesis to determine the subjective weight and objective weight of each index combining subjective and objective integrated comprehensive weights, emerging business investment evaluation system and evaluation model is set up, and calculate each business comprehensive score. Three key emerging businesses, smart power grid and value-added services, integrated energy services and high-end equipment manufacturing are selected to verify the validity of the investment value evaluation model. This study is helpful to improve the efficiency and precision of the power grid investment, and accurately evaluate the power grid investment benefit, which has important practical significance.