A　novel　and　submicro-scale　aluminum　branched　oligo(phenylphosphonate)　(AHPP)　has　been　successfully　synthesized　and　embedded　into　a　polymeric　substrate　to　improve　the　fire　safety　of　epoxy　resin　(EP).　The　chemical　structures　of　intermediates　and　target　products　were　characterized　using　the　nuclear　magnetic　resonance　spectroscopy,　X-ray　diffraction　and　Fourier　transform　infrared　analysis.　Morphology　analysis　confirmed　that　all　of　the　as-synthesized　AHPP　submicro-particles　are　mutually　well-separated.　Combustion　results　demonstrated　that　the　limiting　oxygen　index　value　is　increased　to　30.5%　from　23.5%　while　the　PHRR　and　THR　are　decreased　by　ca.　68.1%　and　41.2%,　respectively　for　the　EP/AHPP-7.5　composite　compared　to　the　corresponding　values　for　pure　EP.　In　addition,　the　binary　blends　display　the　satisfying　smoke　toxicity　suppression　performance　during　combustion.　The　total　smoke　production　and　the　total　CO　yield　for　EP/AHPP-7.5　are　dramatically　reduced　by　62.0%　and　32.3%,　respectively,　which　may　mainly　be　ascribed　to　the　catalytic　carbonization　performance　of　the　polymers　and　formation　of　Al2O3　layers　on　the　surface　of　the　char　residues.　As　a　result,　the　findings　in　this　study　enabled　the　submicro-scale　phosphorus-containing　flame　retardant　to　be　a　potential　candidate　as　an　efficient　additive　for　reducing　smoke　toxicity　of　polymer　composites.　©　2019　Elsevier　B.V.