As　the　raw　material　for　fabricating　polyphenylene　sulfide　(PPS)　fibers,　PPS　resin　exhibits　great　processing　and　application　value.　However,　the　oxidative　cross-linking　among　PPS　molecules　at　high　temperatures　causes　increasing　melt　viscosity　and　decreasing　fluidity,　making　PPS　processing　difficult　and　lower　production　quality　and　efficiency.　In　this　research,　we　realize　the　dual　improvement　of　PPS　resin　in　the　fluidity　and　oxidation　resistance　by　introducing　a　new　AO-g-C3N4　composite　modifier.　First,　an　antioxidant　(AO)　was　grafted　onto　the　surface　of　graphitic　carbon　nitride　(g-C3N4)　through　amination　to　synthesize　AO-g-C3N4.　Subsequently,　AO-g-C3N4　was　incorporated　into　PPS　resin　using　the　melt　extrusion　process,　yielding　a　novel　flow-enhancing　and　antioxidant　PPS-based　composite　material.　It　is　found　that　the　AO-g-C3N4/PPS　material　possesses　excellent　properties　with　a　significantly　raised　melt　index　(＞50　%)　and　notably　decreased　shear　viscosity　(＞20　%).　Besides,　the　dynamic　oxidation　induction　temperature　of　AO-g-C3N4/PPS　has　increased,　indicating　inhibited　oxidative　cross-linking,　while　the　crystallinity　has　increased.　These　suggest　that　the　incorporation　of　AO-g-C3N4　into　PPS　resin　can　enhance　its　fluidity　and　antioxidation　properties,　providing　valuable　insight　for　the　modification　research　of　PPS　resin.　The　AO-g-C3N4/PPS　exhibits　the　characteristic　of　easier　processing,　which　offers　promising　prospects　for　developing　the　downstream　industry　of　PPS　resin.　©　2025　Elsevier　Ltd