The invention relates to a flame-retardant AES composite material. The flame-retardant AES composite material comprises, by weight, 70-90 parts of AES, 3-5 parts for methyl silicone resin, 16-20 partsfor a phosphorus-nitrogen flame retardant, 4-10 parts of montmorillonite, 0.2-0.6 part of nano-silica, 0.2-0.4 part of a compatibilizer, 0.1-0.5 part of an antioxidant and 0.2-0.4 part of a lubricant. The montmorillonite and the phosphorus-nitrogen flame retardant have synergistic flame-retardation effects, and the addition of the two components enhances the flame retardation property of an ABS/IFR system. The addition of a small amount of nano-SiO2 can catalyze the esterification reaction of the phosphorus-nitrogen flame retardant, promote the formation of carbon, enhance the heat and oxygenbarrier effect of a carbon layer and improve the flame retardation property of the material. The small amount of nano-SiO2 can also promote the cross-linking of AES, so the mechanical properties of the AES composite material are greatly improved, the application field of flame-retardant AES is expanded, and the flame-retardant AES composite material has great research significance and applicationvalues.