The invention belongs to the technical field of pesticide preparation, and particularly relates to emamectin benzoate-indoxacarb water dispersible granules and a preparation method thereof. The emamectin benzoate-indoxacarb water dispersible granules are prepared from the following components in parts by weight: 3.7-4.3 parts of emamectin benzoate, 5.7-6.3 parts of indoxacarb, 4-5 parts of diisooctyl phthalate, 3-4 parts of trans-2-hexenol, 3-4 parts of alpha-pinene, 1-2 parts of sucrose ester, 1-2 parts of hexyl acetate, 2-4 parts of syrup, 5-10 parts of tea saponin, 12-15 parts of lignosulfonate, 0.2-5 parts of a stabilizing agent, 0.2-3 parts of an attractant, 1-8 parts of an anti-freezing agent, 2-3 parts of a preservative, 10-20 parts of an antifoaming agent, 5-8 parts of an antioxidant, 2-4 parts of an adhesive, 20-25 parts of a disintegrating agent and a proper amount of wood vinegar. The preparation method of the emamectin benzoate-indoxacarb water dispersible granules comprises the following steps: mixing raw materials, then performing fluid energy milling, adding a proper amount of the antifoaming agent and the wood vinegar, and performing granulation, drying and sievingto obtain water dispersible granule products.