In response to the lack of objectivity in evaluating the green construction level of prefabricated residential buildings by using traditional methods,the COWA grey clustering evaluation method is proposed.Combining with examples of prefabricated building projects,a comprehensive evaluation system consisting of 31 indicators is constructed,and the indicators are weighted in order to comprehensively analyze the green construction level of prefabricated residential buildings,which avoids the negative impact of subjective factors and extreme data on the accuracy of the evaluation results.The feasibility of the evaluation method in this paper is tested by comparing it with the actual situation of prefabricated building projects.The results show that the comprehensive evaluation value of green construction based on the method proposed in this article is 7.4097.By comparing and analyzing with the actual situation on site,it can be seen that the consistency between the two is high,indicating that the evaluation results of the method proposed in this article are reliable.The research could provide ideas for the evaluation of green construction level in prefabricated residential buildings.