There　has　been　extensive　research　on　biochar　materials　in　the　field　of　adsorption,　catalysis,　etc.　Hereon,　we　reported　a　gentle　synthesis　of　electrode　by　abundant　biomass　of　municipal　sludge　and　cheap　precursor　of　boric　acid　as　carbon　source　and　boron　source.　Experimental　results　demonstrated　that　a　small　amount　of　boron　doping　had　a　profound　impact　on　the　elemental　composition　and　active　sites　of　sludge-based　biochar　significantly,　resulting　the　improvement　of　EF　activity　for　sulfamerazine　(SMR)　removal.　Under　the　optimal　reaction　conditions,　including　initial　pH,　added　divalent　iron,　applied　current　and　air　flow,　95.12%　of　SMR　could　be　removed　in　180　min　in　EF　system.　It　was　confirmed　that　hydroxyl　radical　(center　dot　OH)　and　superoxide　radical　(center　dot　O-2(-))　were　the　primary　active　substances　for　SMR　degradation.　The　effect　experiments　of　various　ions,　types　of　wastewater　and　pollutants　were　carried　out　and　the　stability　experiments　were　conducted　for　eight　cycles　without　significant　efficiency　loss,　which　proved　the　exceptional　applicability　and　reusability　of　the　gained　boron　doped　sludge-based　biochar　electrode　BSBC-E.　These　functions　of　boron-doped　sludge-based　biochar　cathode　could　be　a　promising　material　for　emerging　organic　contaminants　remediation.