The invention discloses an antibacterial mildew preventive for paper. The antibacterial mildew preventive comprises Hypericum Japonicum, Coriarifa Nepalensis, Urena Lobata, Blastus Cochinchinensis, Radix Ranunculi Ternate, affine cudweed, Artemisia Dubia, sticktight, Radix Litsea Cubeba, Gnetum Montanum, Sanicula Chinensis, leaves of Premna Microphylla Turcz, Zanthoxylum Armatum, Litsea Cubeba, Patrinia Scabiosaefolia, Myrsine Africana, Schima Argentea and Teucrium Viscidum. The antibacterial mildew preventive has the advantages that the antibacterial mildew preventive is made from pure traditional Chinese medicine, and is simple to prepare, low in cost, safe, poisonless, green and environment friendly; extract is purified by DM130 resin, and accordingly, color and printing effect of the paper are not influenced; the adding amount is low, and distilled water is added for dilution during use of the antibacterial mildew preventive; the antibacterial mildew preventive can be added into paper pulp to prepare brand new paper, or directly smeared on the surface of the paper to transform used paper; firm adhesion is achieved, traces are avoided, the antibacterial mildew preventive is convenient to use, and cost is saved; various antibacterial mildew prevention elements are added, the antibacterial mildew preventive has a natural plant scent and can resist bacteria and prevent mildew, allergy is avoided, smoothness in printing and writing is kept, paper flexibility is not influenced, and weaving is facilitated.