Flame-retardant low-smoke epoxy resin and preparation method thereof, and composite material and preparation method thereof

The invention discloses flame-retardant low-smoke epoxy resin and a preparation method thereof, and a composite material and a preparation method thereof. The method comprises the following steps: melting phosphorus-containing modified epoxy resin, and uniformly mixing the molten phosphorus-containing modified epoxy resin with liquid epoxy resin to obtain an epoxy resin mixed solution; uniformly mixing the epoxy resin mixed solution with an additive flame retardant, a synergistic flame retardant and a silane coupling agent to obtain a mixed component; and adding a curing agent into the mixed component, and uniformly mixing to obtain the flame-retardant low-smoke epoxy resin. The flame-retardant grade of the epoxy resin is further improved on the premise of keeping excellent mechanical properties of the epoxy resin by utilizing the synergistic effect of the additive flame retardant and the synergistic flame retardant and matching with the liquid epoxy resin, the solid phosphorus-containing epoxy resin and the