The invention relates to the technical field of wood processing and discloses a green mould-proof insecticide for wood materials. The green mould-proof insecticide is prepared from the following raw materials: cotinus coggygria leaves, Chinese pine leaves, mountain peach bark, catalpa leaves, melia azedarach leaves, paper mulberry leaves, periploca bark, corylus mandshurica, physocarpus monogynus bark, fraxinus malacophylla, clematis finetiana, edgeworthia chrysantha bark, Chinese thorowax root, butea monosperma seeds, centipedegrass, white granulated sugar, gossypol, lactic acid bacteria, wine yeasts and compound enzymes. The raw materials are rich and cheap, are simple to prepare, are green and healthy, are free of any toxic reagent, are friendly to the environment, and are harmless to the human body. Steamer water is reserved and used for extracting and can prevent mould, kill insects, increase flexibility and facilitate processing; and at the same time, water usage can be saved, the environment can be protected, and the cost can be saved by 10.2%. Through the double fermentation of the lactic acid bacteria and the wine yeasts, plant cell structures are destroyed, the extracting of effective components is promoted, small-molecular antibacterial components are increased, the mould-proof and insecticidal effect is enhanced, the antibacterial rate reaches 81.7%, and the insecticidal rate reaches 78.3%.