The invention discloses modified rosin-based UV-curing resin shown in formula (1) as well as a preparation method and an application thereof in the UV curing field and belongs to the organic synthesisfield. According to the method, a polar organic solvent is used as a reaction medium, a polymerization inhibitor is added under the protection of nitrogen, quaternary ammonium salt is used as a catalyst, and dimaleopimaric acid bisamide and glycidyl methacrylate or glycidyl acrylate react, and the modified rosin-based UV-curing resin is prepared. The method is simple, the reaction condition is mild, expensive equipment and complex technologies are not required, and the synthesized waterborne UV-curing resin has good water solubility and UV-curing activity. The UV-curing resin is suitable to be used as an oligomer of a UV-curing functional material.