For　resource　utilization　of　industrial　solid　waste,　a　1:1　mixture　of　carbide　slag-steel　slag　was　innovatively　selected　as　the　carbon　sequestration　material　for　CO2　2　sequestration　in　this　work,　and　the　carbon　sequestrated　carbide　slag-　steel　slag　material　was　used　as　skeleton　material　to　make　carbon　sequestered　carbide　slag-steel　slag/NaNO3　3　phase　change　composites.　The　carbon　sequestration　and　thermal　storage　properties　of　the　materials　were　characterized.　The　results　showed　that　the　carbon　sequestration　rate　of　the　carbide　slag-steel　slag　hybrid　material　could　reach　24.48　%.　The　thermal　storage　density　of　sample　C-SC4　reached　444.2　J/g,　the　thermal　conductivity　was　1.057　W/(m-K),　and　the　mechanical　strength　was　142.2　MPa.　Compared　to　sample　SC4　without　carbon　sequestration,　the　thermal　storage　density　increased　by　19.7　%,　the　thermal　conductivity　decreased　by　27.5　%,　and　the　mechanical　strength　increased　by　8.4　%.　After　1440　heating/cooling　cycles,　sample　C-SC4　still　has　excellent　chemical　compatibility　and　thermal　storage　properties.　The　unit　thermal　storage　cost　of　C-SC4　is　3.34　$/MJ,　significantly　lower　than　that　of　other　composites,　showing　great　commercial　potential.　This　research　opens　a　new　way　for　the　preparation　of　phase　change　composites　by　utilizing　industrial　solid　waste　as　skeleton　material,　helps　to　promote　the　rapid　development　of　the　composite　thermal　storage　industry.