Nowadays,　there　are　many　types　of　flame　retardants,　whether　halogenated　or　halogen-free,　that　can　improve　the　flame　retardancy　of　wood.　However,　they　continue　to　pose　a　significant　threat　to　our　environment　and　cause　a　substantial　increase　in　the　weight　gain　rates　after　treatment.　It　is　highly　desirable　yet　challenging　to　develop　an　eco-friendly　and　efficient　flame　retardant　with　low　weight　gain　rates.　Here,　we　report　a　simple　and　fast　process　for　making　eco-friendly　flame　retardants　(chitosan,　gelatin,　sodium　phytate　and　clay)　with　weight　gain　rates　of　3.7　%,　which　form　excellent　flame　retardancy　systems.　This　method　can　be　used　to　create　a　53.5　%　reduction　in　peak　heat　release　rate　(pHRR)　an　189　%　increase　in　ignition　time　(cone　colorimeter),　and　a　71.9　%　reduction　in　peak　temperature　(alcohol　spray　lamps)　compared　to　raw　wood.　The　results　displayed　that　the　effect　of　flame　retardancy　(Decreased　ratio　for　pHRR/Weight　percent　gain)　was　the　best　in　the　past　three　years.　In　addition,　the　flame　retardancy　mechanism　is　thoroughly　analyzed　using　the　techniques　of　Raman　and　so　on.　This　study　proposes　a　novel　strategy　featured　by　eco-friendly　and　simple　preparation　process　for　enhancing　the　flame　retardancy　of　wood　in　important　areas.