The invention relates to a Chinese herbal medicine prevention and control agent for common tea pests and a preparation method of the agent, and belongs to the technical field of common crop pest prevention and control. The prevention and control agent is prepared from cucumber stems, butter gourd stems, pepper leaves, ginger leaves, radix bupleuri, konjak, orange leaves, lemon, peach trees, litchi, betel nuts, maple, anise, pepper, parthenocissus tricuspidata, artemisia argyi, Chinese ilex, wild chrysanthemum flowers and pig bile. The preparation method specifically includes the following steps of firstly, weighing; secondly, mixing and smashing; thirdly, cooking; fourthly, filtering; fifthly, secondary cooking; sixthly, secondary filtering; seventhly, finished product obtaining. The Chinese herbal medicine prevention and control agent is a liquid agent developed through Chinese herbal medicines, is good in pest and bacteria killing effect, low in toxicity, free of residues, capable of being easily absorbed by plants and harmless to human bodies, can supplement calcium, vitamins, potassium, phosphorous, selenium, iron and other elements required in the tea growth process, and promotes the vegetative growth of tea after being sprayed.