Green energy saving is the development direction of modern architectural engineering. The ultimate goal of green building energy saving is to reduce the use of energy and resources through reasonable design, so as to reduce the pollution caused by resource development and utilization. It can use itself to form a harmonious and unified organic circulation system with the surrounding environment, and can coordinate with the surrounding environment to realize the sustainable development of modern architecture. This paper selects the low-carbon energy-saving design of green buildings as the research object. Based on the brief introduction of design principles, the necessary discussion is made from aspects of lighting, ventilation and environmental design, aiming at effectively promoting related work.