The invention relates to an insecticide, in particular to a pure natural plant insecticide. The pure natural plant insecticide is prepared from the following components in percentage by weight: 5 to 10 parts of onion, 1 to 5 parts of hot peppers, 2 to 5 parts of tobaccos, 5 to 8 parts of fresh gingers, 5 to 10 parts of bitter gourd, 12 to 25 parts of tomato leaves, 8 to 16 parts of citrus peels, 10 to 16 parts of honeysuckles, 6 to 10 parts of saponins, 5 to 10 parts of castor leaves, and 80 to 150 parts of solvents. The pure natural plant insecticide uses pure natural plant extracts, is safeto use, has a wide insecticidal spectrum, high efficiency, and low toxicity, is easily degradable, has no residue and no drug resistance, has a repelling and killing effect on most plant pests, has nopollution to humans, animals and environment, and is an ideal insecticide for environmental protection.