The invention belongs to the technical field of archive storage and relates to a preparation method for a worm-eating prevention composition for paper archives. The preparation method comprises the following steps: weighing Korea-lily straws, mint leaf straws, chrysanthemum leaf straws, fennel leaf straws and lime powder; cutting plant materials into strips or slices, mixing, and drying in a shady place to obtain a plant mixture; putting the plant mixture into a grinder and grinding to obtain plant powder; putting the plant powder and the lime powder into a container and stirring uniformly to obtain mixed powder; and preparing a cloth bag from nonwoven cloth or crocus cloth, soaking the cloth bag into an ethanol water solution, taking out and drying in air, preparing a square box body according to the size of the cloth bag, putting the mixed powder into the nonwoven cloth bag or the crocus cloth bag, sealing, packaging, and putting a packaged material into the square box in a laying manner to prepare a worm prevention box for the paper archives. The composition is prepared by mixing the pure natural plants with the lime powder, is free from toxic and side effects on a human body, low in processing cost, simple in preparation principle and convenient to use, and achieves safe and environment-friendly effects.