Pyrethroid waterborne emulsion and the method for preparing the same

The invention discloses a pyrethroid aqueous micro-emulsion and its preparation method, which is composed of pyrethroid, N-C1 to N-C4 alkyl pyrrolidone, C6 to C8 pyrrolidone, EO/PO block copolymer surfactant, cstor oil polyethenoxy ether or ethoxylated triethyl phenol, phosphate buffer solution, and water. The preparation method comprises the steps of mixing and stirring N-C1 to N-C4 alkyl pyrrolidone, C6 to C8 pyrrolidone, EO/PO block copolymer surfactant, and cstor oil polyethenoxy ether or ethoxylated triethyl phenol to obtain an inactive matrix, and then mixing the inactive matrix and the pyrethroid to obtain the high- concentration micro-emulsion, finally, diluting the high- concentration micro-emulsion with water to obtain the product. The micro-emulsion without nonylphenol polyethenoxy ether is provided with reduced pesticide toxicity and environmental pollution and can exist stably at the normal temperature. The preparation method is characterized by simple process and low cost.