Background: Sustainable development is a global trend, prompting the development of green school buildings. Green building and low-carbon campus promotion in junior high schools and elementary schools were researched in this study to facilitate improved environmental protection, energy saving, and carbon reduction as well as the construction of green, low-carbon campuses. Methods: A review of green building certification approvals was used to establish a green campus assessment system with suitable sustainability factors. Relevant indicators were constructed using the Fuzzy Delphi Method and the Analytic Hierarchy Process. Questionnaires were administered to various types of experts regarding the decision sequence for constructing a green, low-carbon campus in junior high schools and elementary schools. Results: The decision most highly prioritized by all experts was related to lifestyle education and policy management. A healthy campus environment was assigned second place. Energy- and carbon-saving planning and the ecoenvironment were ranked lower. The results provide a reference for architectural planning and implementation, for schools, and for researchers. Conclusion: The government can use them to inform appropriate policies and to establish priorities and indicator weights for promoting green, low-carbon school campuses. Education resources can thereby be reasonably allocated, green building quality on campuses enhanced, and energy-saving and carbon-saving measures implemented.