Owing　to　the　excellent　mechanical　properties,　processability,　thermal　stability　and　environmental　friendliness,　polylactic　acid　(PLA)　has　showed　numerous　applications　in　medical　devices,　electronic　products,　and　buffering,　etc.,　but　hampered　by　its　intrinsic　flammability,　accompanied　by　release　of　a　lot　of　heat　and　toxic　fumes　during　combustion.　Herein,　aluminum　hypophosphite　(AHP)　modified　MXene　hybrids　(AHP-Ti3C2Tx)　were　synthesized　via　salt-forming　reactions　and　hydrogen　bonding　induced　assembly,　which　were　then　incorporated　into　PLA　in　combination　with　silicon　microencapsulated　ammonium　polyphosphate　(SiAPP).　Due　to　the　synergistic　effect　between　SiAPP　and　AHP-Ti3C2Tx,　the　fire　resistance　of　PLA　composites　has　been　greatly　improved.　For　instance,　the　peak　of　heat　release　rate,　total　heat　release　and　peak　of　smoke　production　rate　of　the　PLA　composite　containing　13.0　wt%　SiAPP　and　2.0　wt%　AHP-Ti3C2Tx　decreased　by　60.2%,　50.6%　and　44.3%,　respectively.　The　synergistic　charring　function　between　Ti3C2Tx　and　SiAPP,　and　the　thermal　oxidation　and　＂tortuous　path＂　effect　of　Ti3C2Tx　nanoplates　together　with　the　capture　effect　of　SiAPP　are　responsible　for　a　significant　improvement　in　the　fire　resistance　of　the　polymer　material.