A natural-based modified light-cured resin comprises the following components: epoxy tung oil, acrylate, low-molecular-weight epoxy resin, a polymerization inhibitor, maleic anhydride and an additive. The resin is prepared through a special manufacturing process, and the defect that light-cured resin prepared through a conventional preparation process is poisonous and contains lots of poisonous substances is overcome, so that not only is human health protected, but also environmental harmonious development is promoted; raw material obtain manners are increased, the production cost of manufacturing enterprises is reduced, and risks caused by little raw material purchase manners are reduced; through the great use of the plant raw materials, the degradability of the produced resin is improved, and especially in a dental treatment process, green, nontoxic, environment-friendly and health concepts are better reflected.