From the perspective of power grid enterprises,the effect of electric power system reform on all aspects of the power grid enterprise and the difference in cost accounting of power grid enterprises before and after the reform of electric power transmission and distribution price are analyzed. Based on the electric power transmission and distribution cost accounting standards under the background of new electrical reform, the power gird enterprise transmission-distribution price model is established, and Mengxi power grid is taken as an example to verify the established transmission-distribution price model. It has a certain reference value for the further improvement of electric power transmission and distribution price accounting.