Geopolymers　have　attracted　extensive　attention　in　the　marine　environment　because　of　its　special　reticulate　nanostructure.　Gel　evolutions　of　copper　tailing-based　green　geopolymers　were　studied　under　air,　deionized　water,　seawater,　freeze–thaw　cycle　and　carbonization　environments.　Their　mechanical　properties　and　microstructures　were　characterized　by　compressive　strength　mea-surement,　X-ray　diffraction　(XRD),　Fourier-transform　infrared　spectroscopy　(FTIR),　nuclear　magnetic　resonance　(NMR)　and　scanning　electron　microscopy　(SEM).　It　was　found　that　the　deionized　water　and　natural　marine　water　exposure　promoted　the　evolution　degree　of　geopolymers　and　improved　their　compressive　strength,　while　exposure　to　the　carbonization　environment　weakened　the　gel　evolution　and　decreased　the　cross-linking　degree　of　the　Sodium　aluminosilicate　hydrate　(N-A-S-H)gel　structure,　resulting　in　a　decline　of　compressive　strength.　The　geopolymer　exposed　in　the　freeze–thaw　cycle　exhibited　the　worst　deterioration　due　to　the　expansion　caused　by　the　crystallization　in　the　geopolymer.　These　results　are　essential　and　beneficial　to　further　understanding　the　gel　formation　process　in　various　marine　environments　and　could　promote　the　investigation　of　green　concrete.　©　2022　by　the　authors.　Licensee　MDPI,　Basel,　Switzerland.