Aiming　at　the　problems　of　lack　of　carbon　sources　for　nitrogen　removal　and　low　phosphorus　removal　efficiency　of　constructed　wetlands　(CWs)　in　treating　wastewater　treatment　plant　(WWTP)　effluent,　an　electrolysis　assisted　constructed　wetland　(E-CW)　with　coconut　fiber　as　substrate　and　solid　carbon　sources　was　constructed.　The　synthetic　secondary　effluent　was　used　as　the　influent　of　the　E-CW　with　a　wastewater　treatment　capacity　of　140　L　d-1.　The　total　nitrogen　(TN)　and　the　total　phosphorus　(TP)　removal　efficiency　of　the　E-CW　with　coconut　fiber　treating　WWTP　effluent　were　69.4%　and　93.3%,　respectively,　which　were　54.3%　and　88.2%　higher　than　those　of　CW　with　coconut　fiber　and　no　electrolysis.　The　removal　efficiency　of　TN　was　39.9%　higher　than　that　of　E-CW　with　gravel.　The　current　intensity　had　significant　effect　on　nitrogen　removal　efficiency　and　the　release　of　carbon　sources　from　coconut　fiber.　When　current　intensity　increased　from　0.25　A　to　1.00　A,　the　TN　removal　efficiency　and　nitrate　removal　rate　increased　by　21.1%　and　0.21　mg　L-1　h-1,　respectively,　and　the　volatile　fatty　acids　(VFAs)　released　from　coconut　fiber　increased　by　57.7　mg　L-1.　The　16S　rRNA　high-throughput　sequencing　results　indicated　that　the　main　functional　nitrogenremoving　microbes　were　Hydrogenophaga,　Thauera,　Rhodanobacteraceae_norank,　Xanthobacteraceae_norank,　etc.　Multiple　paths　including　autotrophic　denitrification　with　hydrogen　and　Fe2+　as　electron　donors　and　heterotrophic　denitrification　were　achieved　in　the　system.　Meanwhile,　the　main　functional　lignocellulose　degradation　microbes　were　enriched　in　the　system,　including　Cytophaga_xylanolytica_group,　and　Caldilineaceae.　Because　electrolysis　created　a　favorable　environment　for　them　to　release　carbon　sources　from　coconut　fiber.　This　study　provided　a　new　perspective　for　advanced　nutrients　removal　of　WWTP　effluent　in　CWs.