In order to scientifically and normatively promote the low-carbon transformation of the power industry and carbon emission reduction in the engineering field, and guide the power grid enterprises to scientifically and normatively implement green construction and energy consumption reduction work, this study carried out a multi-angle comparative analysis of the commonly used carbon emission measurement methods at home and abroad, including three widely used methods. Through multi-dimensional comparison of calculation principle, input data, advantages and disadvantages and application level, a method of carbon emission measurement more in line with the construction link of power grid engineering is obtained. This method needs to calculate the carbon emission coefficient method in the construction link according to the data resources available in the current power industry quota. The conclusions of this paper can lay a methodological foundation for the standardization, scientization and rationalization of the carbon emission measurement work of the subsequent power grid transmission and transformation projects.