A　novel　integrative　supramolecular　intumescent　flame　retardant　was　fabricated　by　self-assembly　of　melamine,　paminobenzene　sulfonic　acid　and　phytic　acid　and　was　abbreviated　as　MAP.　After　chelation　with　Fe3+　or　Zn2+,　the　resulted　products　(MAP-Fe　and　MAP-Zn)　were　melt-blended　with　polylactic　acid　(PLA)　to　enhance　the　flame　retardancy　of　PLA.　The　fire　performance　was　characterized　by　limiting　oxygen　index　(LOI),　UL-94　vertical　burning　and　cone　calorimeter　tests.　The　results　showed　that　control　PLA　was　flammable　with　a　low　LOI　of　20.4%,　and　it　cannot　satisfy　any　UL-94　grade　for　its　severe　ignited　dripping,　whilst　the　incorporation　of　3%　MAP-Zn　increased　the　LOI　to　29.2%,　upgraded　the　UL-94　rating　to　V-0,　and　reduced　the　peak　heat　release　rate　by　18.7%.　It　was　proposed　that　MAP-Zn　mainly　promoted　the　formation　of　more　graphitic　carbon　in　the　char　residues.　In　addition,　the　presence　of　3%　MAP-Zn　slightly　reduced　the　tensile　strength　of　PLA　from　64.9　MPa　of　the　control　PLA　to　60.1　MPa,　which　met　the　requirements　of　most　practical　applications.