The invention discloses a pollution-free pesticide for forestry, which is composed of the following components in parts by weight: 1-3 parts of Metarrhizium anisopliae powder, 5-6 parts of bacteriophage powder, 2-4 parts of Bacillus thuringiensis powder, 1-6 parts of herba houttuyniae, 4-9 parts of chinaberry fruit leaf, 1-6 parts of tortoise plastron, 7-11 parts of notopterygium root, 2-9 parts of polygala root, 5-8 parts of Fructus Forsythiae, 4-7 parts of radix adenophorae, 3-5 parts of Chinese wingnut leaf, 11-24 parts of pepper, 1-10 parts of synergist, 10-20 parts of stemona, 15-20 parts of chinaberry fruit, 4-10 parts of camphor, 3-4 parts of emulsifier, 1-10 parts of synergist, 12-18 parts of herba houttuyniae, 5-18 parts of creat and 100 parts of water. The green pesticide for trees and flowers is a novel pesticide which has high efficiency, pertinence, environment friendliness, no secondary toxicity, no residue and no pollution, keeps ecological balance and is nuisance-free.