The invention relates to a herbicide special for a soybean field.The herbicide is prepared from, by weight, 10-90 parts of flumioxazin, 1-10 parts of wetting agent, 1-10 parts of dispersing agent and 1-88 parts of carrier.The ingredients are simple, and the herbicide has the advantages of being efficient, low in toxicity, low in residue level, high in activity, low in dosage and the like.The herbicide can be degraded easily in the environment and is safe to afterreap crops, the frequency of application is reduced, and cost is reduced.As a low-toxicity fluorine-containing pesticide, the herbicide can be absorbed by buds and blades of a plant to be transmitted in the body of the plant, so that synthesis of chlorophyll is inhibited, withering, whitening, necrosis and death of sensitive weeds can be achieved quickly, and annual broadleaved weeds and part of grassy weeds in the field of soybean, peanut and orchard are effectively controlled.