Herein　a　conspicuously　simple　and　sensitive　electrochemical　sensor　based　on　nanocomposite　architecture　of　the　one-pot　synthesized　carbon　nanodots　(CNDs)　and　chitosan　(CS)　composite　film　was　proposed　for　the　determination　of　triclosan.　The　electrochemical　response　of　triclosan　was　examined,　demonstrated　the　irreversible　electrochemical　oxidation　and　one　electron　involved　process　of　triclosan.　Due　to　the　good　conductivity,　large　surface　area　and　excellent　electrochemical　activity　of　CNDs,　the　CS　and　CNDs　hybrid　film　extremely　amplified　the　electrochemical　response　of　triclosan,　offering　a　highly　sensitive　electrochemical　platform　for　triclosan　detection.　The　detection　limit　of　this　electrochemical　sensor　for　triclosan　could　be　down　to　9.2　nM.　The　as-proposed　sensor　presented　high　sensitivity,　low　detection　limit,　wide　dynamic　response　range,　excellent　stability　and　reproducibility.　This　simple　and　sensitive　electrochemical　sensor　is　promising　in　developing　the　disposable　sensor　for　environmental　monitoring　and　food　inspection.　©　2012　Elsevier　Ltd.