Over　the　past　few　years,　soil-cement　has　been　widely　used　in　marine　geotechnical　engineering;　meanwhile,　the　safety　of　soil-cement　in　marine　environment　has　attracted　wide　attention.　In　order　to　study　the　influence　of　composite　ferronickel　slag　powder　on　the　strength　and　micro　morphology　of　soil-cement　in　marine　environment,　the　composite　nickel　iron　slag　powder　was　added　into　the　soil-cement　in　this　paper.　The　unconfined　compressive　strength　test,　erosion　resistance　coefficient　analysis,　SEM,　and　EDS　test　analysis　of　soil-cement　were　carried　out..　Results　showed　that　the　marine　environment　had　great　influences　on　the　strength　of　soil-cement,　and　the　addition　of　compound　nickel-iron　slag　powder　can　enhance　the　strength　of　soil-cement,　and　the　deterioration　of　the　strength　of　soil-cement　is　reduced.　In　addition,　the　compound　ferronickel　slag　powder　has　microaggregate　effect,　morphological　effect,　and　activation　effect,　which　not　only　improves　compaction　rate　of　soil-cement　and　prevents　invasion　of　erosive　ions　in　marine　environment　but　also　has　positive　effects　on　the　performance　of　soil-cement.