Herein,　a　new　strategy　for　laccase-like　nanozyme　is　proposed　by　utilizing　copper　nanoparticles　(Cu　NPs)　as　the　active　center,　carbon　nitride　as　the　skeleton　and　triazole　groups　as　the　cofactor.　Cu　NPs　incorporated　nitrogen-rich　carbon　nitride　(Cu-g-C3N5)　nanocomposites　are　found　to　possess　excellent　laccase-like　activity,　which　can　catalyze　the　oxidation　of　bisphenol　A　(BPA)　to　produce　a　color　change　in　the　presence　of　4-aminoantipyrine.　The　catalytic　efficiency　of　Cu-g-C3N5　nanocomposites　is　4-fold　higher　than　their　analogue　(Cu-g-C3N4　nanocomposites)　without　triazole　groups.　Cu-g-C3N5　nanocomposites　also　display　robust　catalytic　activity　with　high　temperature　stability,　resistance　to　acid　and　alkalinity,　and　long　term　stability.　Density　functional　theory　calculations　indicate　that　triazole　groups　are　beneficial　to　improve　the　stability　of　Cu　NPs　via　additional　Cu-N　bonds　and　facilitate　the　activation　of　the　adsorbed　O2　molecules.　There　is　a　linear　relationship　between　the　absorbance　and　BPA　concentration　over　the　range　of　0.25–25　mg　L−1　with　the　limit　of　detection　of　0.09　mg　L−1.　Finally,　Cu-g-C3N5　nanocomposites　are　successfully　applied　for　colorimetric　detection　of　BPA　released　from　polycarbonate　microplastics.　To　the　best　of　our　knowledge,　this　is　the　first　example　to　utilize　laccase-like　nanozyme　for　colorimetric　detection　of　BPA.　©　2023　Elsevier　B.V.