This　study　aims　to　evaluate　the　removal　efficiency　of　nitrogen　and　phosphorus　in　the　tidal　and　non-tidal　constructed　wetlands　with　typical　mangrove　(Aegiceras　corniculatum)　as　a　wetland　plant　model　to　treat　simulated　marine　wastewater.　The　results　showed　that　the　average　removals　of　NO2--N,　NH4+-N,　TN　and　TP　were　88.4,　80.5,　81.4,　79.7　and　40.8%　in　the　non-tidal　subsurface　flow　(HF)　mangrove　wetland,　respectively,　and　65.3,　61.3,　90.6,　60.1　and　19.2%　in　the　tidal　(TF)　mangrove　wetland,　and　11.4,　64.6,　68.7,　56.6　and　16.3%　in　the　non-tidal　free　water　surface　(FWS)　mangrove　wetland,　respectively.　Moreover,　it　was　observed　that　the　composition　of　microbial　communities　in　the　HF　mangrove　wetland　was　beneficial　to　the　nitrogen　cycle　and　has　more　quantitative　associations　of　N-metabolism　genes.　The　results　indicated　that　non-tidal　HF　mangrove　wetland　has　a　stable　and　an　effective　capacity　for　potential　treatment　of　marine　wastewater　compared　to　the　non-tidal　FWS　mangrove　wetland　and　tidal　TF　mangrove　wetland.