Based　on　the　cradle-to-grave　theory,　this　study　evaluates　the　carbon　emissions　of　seawater　sea-sand　recycled　aggregate　concrete　(SSRAC).　The　results　show　a　significant　negative　correlation　between　the　water-to-cement　ratio　and　carbon　emissions.　At　a　100%　replacement　ratio,　the　carbon　emissions　of　SSRAC　show　a　reduction　of　15.9%　compared　to　seawater　sea-sand　concrete,　which　due　to　the　carbonation　process　of　RCA.　And　its　carbon　emissions　account　for　83.1%　of　those　of　natural　aggregate　concrete　and　99.4%　of　those　of　recycled　aggregate　concrete　(RAC).　The　reduction　in　carbon　emissions　of　SSRAC　is　attributed　to　the　substitution　effect　of　RCA　and　the　shorter　transportation　distance　of　raw　materials,　which　results　in　a　compensatory　effect　on　carbon　emissions.　When　the　transportation　distance　is　20　km　for　coarse　aggregate　and　300　km　for　fine　aggregate,　the　emissions　of　RAC　exceed　SSRAC　by　876.9%,　which　demonstrates　SSRAC＇s　superior　environmental　performance　in　long-distance　transportation　scenarios.