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The rise of greenhouse gas (GHG) concentration has caused global warming to become a consensus in human society. Carbon emissions from sewage treatment plants are one of the main sources of emissions. Among them, carbon emissions from small town sewage treatment plants cannot be ignored. Based on the life cycle (LCA) evaluation theory, the assessment scope of life cycle carbon emissions of small town sewage treatment plants is defined, and a corresponding evaluation system is constructed. According to the system, the carbon emissions of a small town sewage treatment plant in Jilin are evaluated. Based on the assessment results, the ways to reduce carbon emissions from small town sewage treatment plantswere discussed to provide a reference for their emission reduction.