Compound powder for increasing grape yield and preparation method thereof

The invention relates to a compound powder for increasing grape yield, which is characterized in that the compound powder is prepared by compounding a cassava anaerobic fermentation product and a citric acid soluble silicate iron salt, and the mass percentage concentration of the cassava anaerobic fermentation product is 50-60%; the compound powder for increasing the grape yield further comprisesan auxiliary component with the mass percentage concentration of 6%-12%, and the auxiliary component comprises potassium alginate, water-soluble tetrazole-4, phosphorus-modified hyperbranched chitosanand dry pig manure; and the mass ratio of the potassium alginate to the water-soluble tetrazole-4 to the phosphorus-modified hyperbranched chitosan to the dry pig manure is 1 to (0.1 to 0.3) to (1 to2) to (2 to 3). The invention further provides a preparation method of the compound powder for increasing the grape yield. The composite powder for increasing grape yield disclosed by the invention is high in fertilizer effici