The invention discloses a Chinese herbal medicinal bactericide for crops, and a preparation method thereof, and belongs to the technical field of Chinese herbal medicinal pesticides. The Chinese herbal medicinal bactericide comprises 30-50 parts of alcohol, 4-7 parts of lime, 2-3 parts of sulfur, 5-9 parts of garlic, 3-5 parts of clove, 6-10 parts of Japanese banana leaves, 3-7 parts of Quisqualis indica, 5-8 parts of tobacco leaves and 3-8 parts of Gleditsia sinensis. The preparation method comprises the steps of raw material processing, extraction, decoction, spray drying, drying and packaging. Raw materials of the Chinese herbal medicinal bactericide for crops are natural materials, so the Chinese herbal medicinal bactericide has the advantages of nontoxic components, no residual and no pollution; and the preparation method of the Chinese herbal medicinal bactericide has the advantages of simplicity, easiness in operation, low production cost, and convenience in use.