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　nano　-composites)　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　cal-culations　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.