Ingesting　microplastics　(MPs)　from　plastic　tableware　is　an　important　source　of　health　risk　to　human　bodies.　However,　the　comprehensive　information　of　MPs　released　from　disposable　tableware　has　not　been　explored.　Herein,　a　new　visual　quantification　method　for　polystyrene　MPs　is　proposed　with　carbon　nitride　fluorescent　polymers　staining,　which　can　overcome　the　disadvantages　of　high　signal　background　and　photobleaching　derived　from　organic　dyes　staining.　Combining　with　fluorescence　microscope　and　ImageJ　software,　the　quantity,　shape,　and　size　distribution　of　MPs　carried　by　the　brand-new　disposable　polystyrene　tableware　(DPT)　samples　before　usage　and　released　from　the　clean　DPT　samples　in　different　simulated　usage　scenes　were　studied.　The　brand-new　DPT　samples　were　found　to　carry　a　large　number　of　MPs　particles　and　the　clean　DPT　samples　could　release　MPs　during　usage.　Fiber　and　fragment　are　the　main　morphology　of　the　detected　MPs　and　fiber　accounts　for　45–52　%.　The　particles　with　size　©　2022　Elsevier　B.V.