In order to further promote the low-carbon and energy-saving development of township sewage treatment, the current situation of township sewage treatment and the problems existing in collection, treatment, construction and operation and maintenance management are analyzed, and the policy background of the national "double carbon" goal and the previous design, construction and operation experience are combined, the optimization points of sewage treatment plant and supporting pipe network design under the background of "double carbon" are summarized and proposed. The results show that the problems of high standard design, high cost investment and operational difficulties can be effectively solved by optimizing the design. The results can provide reference for the low-carbon, energy-saving, intelligent and high-quality transformation of township sewage treatment systems.