[Purposes] To effectively reduce carbon emissions during construction process, the construction schemes of municipal road with higher level of green construction is optimized and selected to improve the level of scientific and technological innovation and green construction for municipal roads. [Methods] From the perspective of carbon emission reduction, aiming at the comprehensive evaluation problem of green construction of municipal road, and combined with the characteristics of municipal road construction, the evaluation system and standards are established for green construction of municipal road, and a grey correlation model was constructed based on combination weighting. On the basis of the comprehensive subjective and objective weights, the grey correlation degrees of all indexes and construction schemes of each road section are further calculated by the grey correlation method, then the green construction levels are analyzed and compared. [Findings] The municipal road green construction evaluation system established in this study demonstrates applicability, as the proposed model is validated through the construction schemes of various sections of municipal roads in Changsha. The validation results align with the actual situation, leading to the identification of a rational set of green construction schemes for municipal roads.[Conclusions] The application of grey correlation theory based on combination weighting in the evaluation of green construction of municipal road is feasible and scientific, which provides a reference for the scheme design of green construction of municipal road.