The invention discloses three-functionality-degree epoxy acrylic resin and a preparation method and application thereof. The structural formula of the three-functionality-degree epoxy acrylic resin isas shown in the specification. The three-functionality-degree epoxy acrylic resin and the preparation method thereof have the advantages that cycloaliphatic epoxy acrylate is introduced to replace traditional bisphenol A epoxy acrylate and phenolic epoxy acrylate, so that the viscosity of the prepared three-functionality-degree epoxy acrylic resin is lowered greatly, and the production process issimplified greatly; meanwhile, the problem that the light aging resistance and yellowing resistance of traditional epoxy acrylic resin are poor is solved; the prepared three-functionality-degree epoxy acrylic resin is low in viscosity, good in curing speed, light aging resistance and yellowing resistance, widely applicable to the field of coating, ink or adhesives, and the like.