The invention discloses a Chinese herb medicinal prevention and control agent for common rice diseases and a preparation method thereof, and belongs to the technical field of Chinese herb medicinal pesticides. The Chinese herb medicinal prevention and control agent is prepared from the following raw materials: 5 to 15 parts of celery, 2 to 8 parts of peppermint leaf, 3 to 9 parts of herba schizonepetae, 2 to 7 parts of vervain, 1 to 8 parts of herba houttuyniae, 2 to 9 parts of radix platycodonis, 2 to 12 parts of pomegranate, 1 to 10 parts of cannabis leaf, 1 to 6 parts of spanishneedles herb, 1 to 6 parts of rhizaoma corydalis, 2 to 10 parts of garlic, 2 to 13 parts of lime, 1 to 8 parts of zanthoxylum piperitum, 1 to 5 parts of tribulus terrestris, 2 to 6 parts of perilla frutescens, 2 to 9 parts of Japanese banana leaf, 2 to 12 parts of typhonium giganteum, 1 to 6 parts of safflower, 2 to 13 parts of plant ash, 1 to 7 parts of common cruculigo rhizome and 2 to 4 parts of rhizoma cyperi. The preparation method comprises the steps of raw material treating and extracting, spray drying, drying and packaging. According to the Chinese herb medicinal prevention and control agent for common rice diseases and the preparation method thereof, the raw materials are all natural materials, and are free from toxicity, residues and pollution; moreover, the Chinese herb medicinal pesticide is simple in production method and low in production cost and, is easy to operate, and is convenient to use.