The invention discloses a purely natural 
plant insecticide, relating to an insecticide which is prepared by taking natural plants as raw materials and is applied to various crops of wheat, rice, peanut, 
soy bean, vegetables, fruits, and the like. The purely natural 
plant insecticide is characterized by comprising the following components in parts by weight: 10 to 18 parts of pine needle, 4 to 10 parts of 
sophora flavescens, 4 to 12 parts of southernwood, and 60 to 80 parts of 70-100% 
alcohol. The manufacture method comprises the following steps of: crashing each 
raw material, placing the raw materials to the 
alcohol, sealing a hole, soaking the raw materials for 20 to 35 days, filtering the mixture to form liquid 
medicine, and preserving the liquid 
medicine to a pot or a 
bottle. The invention has the advantages of wide insecticidal range, no toxic to plants, people and animals, good insecticidal effect, capability of replacing 
low toxicity pesticides, vast potential for future development, less investment for manufacture equipment, simple preparation 
processing, easy popularization and benefit for peasants, and can kill pests of whiteflies, aphides, red spiders, liriomyza, thrips, cotton bollworms, pink worms, caterpillars, dark greyish green moths, small noctuids, needle rollers, and the like.