Sulfoxides　are　actively　engaged　as　versatile　synthetic　building　blocks,　chiral　ligands,　bioactive　molecules,　and　function　materials.　However,　their　oxidative　syntheses　from　thioethers　are　inevitably　impeded　by　overoxidation,　excess　oxidants,　and　the　tedious　preparation　of　thioethers.　To　address　these　shortcomings,　we　report　herein　a　highly　selective　electrochemical　sulfoxidation　reaction　featuring　the　use　of　simple　starting　materials,　i.e.,　thiols　and　alkyl　halides,　in　a　single　operation.