The invention discloses a method for producing an oil-field drag reducing agent. The drag reducing agent comprises the following raw material components in parts by weight: a main agent: 30-50 parts of polyethylene oxide, 30-80 parts of acrylamide, 100-250 parts of a sulfonate, 35-95 parts of modified acrylic acid, 200-280 parts of polyisobutylene, 100-160 parts of an organosilicone, 5-15 parts ofpolyimide, 50-150 parts of a sodium secondary alkylsulfonate, 10-90 parts of an allyl resin, 20-50 parts of an amino resin, and 300-600 parts of distilled water; and an auxiliary agent: 20-45 parts of a pressure-sensitive adhesive, 10-25 parts of a curing agent, 25-35 parts of a monoalkyl phosphate, 18-35 parts of polyvinyl acetate, 60-100 parts of isopropyl alcohol, 75-150 parts of benzyl alcohol, and 60-120 parts of a polyether polyol. The invention relates to the technical field of drag reducing agents. According to the method for producing the oil-field drag reducing agent, the oil-fielddrag reducing agent can adapt to a relatively low temperature after the production is completed, the production environment of the drag reducing agent in the high-latitude is effectively maintained, and the drag reducing agent can maintain the same experimental effects outdoors as indoor tests by the combined setting of the organosilicone, the allyl resin and the amino resin when the drag reducingagent is at work.