Ferronickel　slag　is　the　solid　waste　slag　produced　by　smelting　nickel-iron　alloy.　After　grinding　ferronickel　slag　into　powder,　it　has　potential　chemical　activity.　It　can　partially　replace　cement　and　reduce　the　amount　of　cement,　and　is　conducive　to　environmental　protection.　The　mechanical　properties　of　soil　cement　were　investigated　through　the　compressive　strength　test　and　inter-split　tensile　test　of　ferronickel　slag　powder　soil　cement　with　different　dosages.　To　further　study　the　mechanism　of　ferronickel　slag　powder＇s　action　on　soil　cement　microscopically,　the　microstructure　of　soil　cement　was　analyzed　by　using　a　scanning　electron　microscope　and　nuclear　magnetic　resonance　equipment.　The　results　of　the　study　show　that　the　incorporation　of　ferronickel　slag　powder　can　enhance　the　compressive　and　tensile　strength　of　soil　cement.　The　best　performance　enhancement　of　ferronickel　slag　powder　was　achieved　when　it　was　doped　with　45%　of　its　mass.　The　hydration　products　of　soil　cement　increased　with　the　increase　in　the　doping　amount,　but　the　excessive　doping　of　ferronickel　slag　powder　would　lead　to　a　weakening　of　the　hydration　reaction　and　a　decrease　in　the　strength　of　the　soil　cement.　At　the　same　time,　ferronickel　slag　powder　plays　the　role　of　filling　the　void　of　soil　cement.　With　the　increase　in　ferronickel　slag　powder,　the　large　pores　inside　the　soil　cement　are　reduced　and　the　structure　is　denser.