Coastal　erosion　is　increasing　worldwide　due　to　the　increasing　frequency　of　extreme　natural　phenomena　and　excessive　human　exploitation.　In　this　study,　a　small　model　experiment　was　conducted　to　investigate　the　solidification　effects　of　three　enzyme　sources—soybean　urease,　freshwater　Bacillus　pasteurella,　and　seawater　domesticated　Bacillus　pasteurella—on　coastal　sediments　and　their　impacts　in　a　seawater　environment.　The　solidifying　effect　of　different　enzyme　sources　was　determined　by　measuring　the　mechanical　properties　and　corrosion　resistance　of　the　cured　specimen　model.　The　influence　of　solidified　seawater　in　a　seawater　environment　was　obtained　by　measuring　the　changes　in　the　pH　value,　calcium　ion　concentration,　and　ammonia　nitrogen　content　of　solidified　seawater.　The　results　show　that　different　enzyme　sources　have　a　certain　strengthening　effect　on　coastal　sediments.　The　mechanical　properties　of　coastal　sediments　can　be　enhanced　by　increasing　the　amount　of　enzyme　solution　or　level　of　solidification　and　can　effectively　resist　simulated　flow　erosion.　Comparing　the　reinforcement　effects　of　different　enzyme　sources,　it　can　be　seen.　It　was　observed　that　Bacillus　pasteurella　acclimated　in　seawater　had　better　reinforcement　effects　than　Bacillus　pasteurella　fresh　water,　and　Bacillus　pasteurella　fresh　water　had　better　reinforcement　effects　than　soybean　urease.　In　the　seawater　measurement　tests,　the　solidification　of　coastal　sediments　using　different　enzyme　sources　led　to　a　decrease　in　the　seawater　pH　value,　and　the　acidification　of　seawater　dissolved　the　generated　calcium　carbonate,　increased　the　concentration　of　calcium　ions　in　seawater,　and　produced　ammonia　nitrogen　as　a　byproduct　in　the　seawater.　It　was　observed　that,　compared　with　the　other　two　enzyme　source　solutions,　the　seawater-domesticated　Bacillus　pasteurella　can　better　adapt　to　the　high-salt　environment　of　seawater,　microbial　metabolism　is　not　inhibited,　urea　decomposition　ability　is　improved,　and　calcium　carbonate　production　is　higher,　which　can　effectively　improve　the　engineering　characteristics　of　coastal　sediments　and　play　a　positive　role　in　coastal　protection　and　development.　©　2023　by　the　authors.