Establish　a　carbon　emission　trading　mechanism　to　integrate　low-carbon　environmental　protection　and　blockchain　technology,　so　that　the　emission　of　pollutants　can　be　rigidly　constrained,　optimise　the　allocation　of　environmental　resources,　and　contribute　to　the　protection　of　ecological　environment　and　the　construction　of　green　homes.　Most　of　the　existing　researches　are　about　the　theoretical　analysis　of　the　carbon　emission　trading　market　and　block　chain,　and　the　research　content　of　the　overall　construction　and　application　of　the　trading　system　is　less.　Starting　from　the　marketisation　of　carbon　emissions　trading,　combining　the　technical　advantages　of　block　chain　decentralisation,　high　security,　and　non-tamper　ability,　this　paper　proposes　a　many-to-many　＂pan-bilateral＂　trading　mechanism,　and　establishes　a　complete　trading　system　structure.　The　system　uses　the　block　chain　as　a　distributed　ledger　to　achieve　the　purpose　of　decentralisation,　reducing　trust　costs　and　transaction　risks;　smart　contract　technology　ensures　that　both　parties　to　the　transaction　have　both　money　and　goods;　the　hash　algorithm　encrypts　data　to　ensure　information　security.　Finally,　use　the　Eclipse　platform　to　conduct　multiple　rounds　of　transaction　simulation　and　performance　testing.　According　to　the　test　results,　the　practicability　and　reliability　of　the　transaction　mechanism　and　system　architecture　in　the　article　was　verified,　and　the　feasibility　of　block　chain　technology　in　the　carbon　emission　trading　market　was　proved.