Preparation method of epoxy resin composite material

The invention discloses a preparation method of an epoxy resin composite material, and belongs to the technical field of polymer composites.The preparation method comprises the steps that S1, carbon fibers are pretreated, specifically, the carbon fibers are subjected to surface treatment through a liquid-phase oxidation method of the carbon fibers, and a modified carbon fiber base material is obtained; s2, modification pretreatment of nano titanium dioxide: carrying out surface treatment on nano titanium dioxide powder, and then carrying out surface coating modification; s3, preparing an epoxy resin composite material; s4, reacting for 6-12 hours after constant-temperature reaction, removing bubbles after vacuumizing and filtering, adding carbon fibers subjected to surface treatment, and fully stirring and mixing; s5, the composite material is obtained after cross-linking and curing. According to the invention, the surfaces of the nano titanium dioxide particles are physically modified, so that the wettabilit