The invention discloses pollution-free special pesticide for broccoli. The pollution-free special pesticide is prepared from the following substances: serissa serissoide, pericarpium zanthoxyli, golden cypress, melia azedarach leaves, menthe leaves, grape seeds, radix polygalae, radix sanguisorbae, chrysanthemum leaves, modified attapulgite and modified bentonite. Traditional Chinese medicine extracting liquid, the modified bentonite and the modified attapulgite are compounded to obtain finished-product pesticide; all the components interact, so that the pollution-free special pesticide has a very good healing effect on common downy mildew, soft rot, damping off, sclerotinia stem rot and the like of the broccoli; the healing rate reaches up to 97.5 percent or more and the diseases do not easily recur; drug resistance is not easy to generate and the stability of the pesticide is better; beneficial components are not easy to decompose and the quality guarantee period can be prolonged to be about three times; after the pollution-free special pesticide is applied, growth properties of broccoli plants are improved better; the content of flavonoids in the cultured broccolis is improved by 30 percent to 40 percent and the content of iron and zinc elements is improved by 10 percent to 20 percent, so that the broccoli has very good edible value.