Herbicide containing fluroxypyr, nicosulfuron and atrazine and preparation method thereof

The invention provides a herbicide containing fluroxypyr, nicosulfuron and atrazine. According to the invention, fluroxypyr, nicosulfuron and atrazine are used as main components, urea is used as a stabilizing agent, and 1-dodecyl azacycloheptane-2-one is used as a synergist; addition of 1-dodecyl azacycloheptane-2-one as the synergist substantially improves the effect of the herbicide. Turpentine-based vegetable oil used as a filling material is extracted from the timber of Chinese pine; the raw material for the filling material is natural and environment-friendly, resources are renewable, and the problem that usage of considerable organic solvents in pesticide preparations poses severe pollution to the environment is thoroughly overcome. Nicosulfuron, atrazine and fluroxypyr have obvious synergistic interaction, and integral drug effect of the herbicide is obviously better than a mixture of individual preparations of nicosulfuron, atrazine and fluroxypyr. Low dosage of the herbicide provided by the invention has a minimum control effect of 80.1% on grassy weeds, a minimum control effect of 86.9% on broad-leaf weeds and a comprehensive control effect of 83.5 to 99.9%; substantial synergy and reduction in drug cost are realized.