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This invention relates to the field of epoxy resins, and discloses an epoxy resin composition, epoxy resin material, its preparation method, and its application. The composition comprises 40-60 parts by weight of glycidyl amine epoxy resin, 10-20 parts by weight of polyenol acetal, 15-45 parts by weight of phenolic epoxy resin, 10-40 parts by weight of phosphorus-containing flame retardant, 1-5 parts by weight of carbon nanotubes, 1-10 parts by weight of curing agent, and 1-10 parts by weight of curing accelerator; the curing agent is a latent curing agent. The epoxy resin composition and epoxy resin material provided by this invention have excellent flame retardant properties, as well as good mechanical and thermal properties.