Vast　amounts　of　electromagnetic　waves　are　generated　in　modern　society,which　severely　endanger　human　health　and　cause　instrument　disturbance.Furthermore,practical　application　of　electromagnetic　shielding　polymer-based　materials　aspires　to　flame　retardancy.Herein,cellulose　acetate　butyrate　modified　ammonium　polyphosphate(CAPP)and　phosphoramide　flame　retardant　decorated　short　carbon　fiber(MSCF)were　synthesized　separately　and　then　simultaneously　blended　into　thermoplastic　polyurethane(TPU)to　prepare　a　series　of　flame　retardant　TPU　composites.Then,the　multi-hierarchical　flexible　TPU/CAPP/MSCF　composites　were　fabricated　via　our　self-developed　air-assisted　thermocompression　method.The　results　revealed　that　the　TPU/CAPP/MSCF　showed　improved　thermal　stability.Moreover,the　TPU/10CA/2.5F　incorporated　with　10.0　wt.％CAPP　and　2.5　wt.％MSCF　respectively　exhibited　77.8％and　58.6％reduction　in　peak　of　heat　release　rate(PHRR)and　total　heat　release(THR),compared　to　those　of　pure　TPU.In　addition,the　TPU/10CA/2.5F　passed　the　UL-94　V-0　rating　test　and　achieved　a　higher　limit　oxygen　index(LOI)(27.3％)than　pure　TPU(21.7％).In　the　case　of　electromagnetic　interference　shielding　effectiveness(EMI　SE),the　TPU/10CA/10.0F-SW　with　10　wt.％CAPP　and　10　wt.％MSCF　dispersed　in　the　surface　layer　and　Ti3C2Tx　MXene　intercalated　in　the　interlayer　exhibited　EMI　SE　of　43.8　dB　in　X　band　and　32.0　dB　in　K　band.Summarily,synergistic　effect　between　CAPP　and　MSCF　together　with　scattered　and　multiply　adsorbed　effect　of　MSCF,MXene　and　CAPP　was　responsible　for　fire　safety　and　EMI　shielding　property　improvements.This　work　provides　a　fascinating　strategy　for　fabricating　multi-hierarchical　flexible　TPU　composites　with　outstanding　flame　retardant　and　EMI　shielding　performances.