The invention discloses a tenacious low-heat-release epoxy resin formula material suitable for a vacuum infusion process and a preparation method thereof .The epoxy resin formula material comprises an epoxy composition A and a curing agent B which are prepared separately, the epoxy composition A is prepared from epoxy resin, 1,6-hexandiol diglycidyl ether and acrylonitrile and isoprene copolymer, the curing agent B is prepared from 4-amion-2,2,6,6-tetramentylniperidine, menthane diamine and polyether amine, and the weight ratio of the epoxy composition A to the curing agent B is 100:40 .According to the tenacious low-heat-release epoxy resin formula material suitable for the vacuum infusion process, not only can the viscosity of a system be decreased, but also the curing exothermal temperature of the system can be decreased, and meanwhile the tenacity of the system is increased.