Belonging to the field of chemical engineering, the invention relates to a method for reducing the acid content of a dimethyldichlorosilane hydrolysate. The method includes the steps of: (a) subjecting the dimethyldichlorosilane hydrolysate and a calcium chloride aqueous solution to countercurrent mixing and washing; (b) then continuously contacting the hydrolysate with a hydrochloric acid mass fraction gradually reduced aqueous phase, and performing full washing. On the basis of washing, the method provided by the invention introduces calcium chloride to increase the proportion of the hydrolysate and water, realizes rapid layering of the two, avoids emulsification phenomenon during washing, and improves the washing and acid removing effects. In addition, the method provided by the invention significantly reduces the consumption of washing water and lowers the production load, and the calcium chloride can be recycled, thus achieving green and clean production.