The invention belongs to the field of preparation of emamectin benzoate preparations and particularly relates to an emamectin benzoate binary joint carrier solid dispersion and a preparation method thereof. Emamectin benzoate serves as a raw drug, PVP K0 serves as a water-soluble carrier, polyacrylic resin III serves as a slow-release material carrier, and the emamectin benzoate binary joint carrier solid dispersion is prepared through a coprecipitation and grinding method, wherein the mass ratio of emamectin benzoate to PVP K0 to polyacrylic resin III is 1:(1-10):(5-10). By using the binary joint carrier, on one hand, the solubility of emamectin benzoate is improved, the bioavailability of emamectin benzoate is improved, and emamectin benzoate can be combined with an aqueous solution better in the spraying insecticide application process; on the other hand, insecticide can be wrapped in the slow-release carrier by means of the porous structure of the slow-release carrier, the release speed of emamectin benzoate is reduced, and lasting period of the insecticide is prolonged. The two carrier materials are matched for use, and comprehensive performance of the emamectin benzoate preparation is improved.