The invention discloses a production method of a reactive organosilicon waterproofing agent, which comprises the following steps: 1) adding a certain amount of deionized water into a mixture containing a nonionic emulsifier and an anionic emulsifier, and stirring at 50-95 DEG C for 20-60 minutes to obtain an emulsifier-water mixture system; 2) regulating the pH value of the emulsifier-water mixture system in the step 1) to greater than or equal to 1 and smaller than 7 or greater than 7 and smaller than or equal to 14 with a pH regulator; 3) proportionally adding an organosilicon ring body and alkoxy silane or mixture thereof into the emulsifier-water mixture system in the step 2); and 4) after finishing charging, stirring for polymerization at 50-95 DEG C for 30-480 minutes. The method has the advantages of cheap and accessible raw materials, and is simple to operate, easy to implement and convenient for property regulation. The prepared product has the advantages of uniform dispersion, favorable stability, favorable weather resistance, high adhesion, favorable washing fastness, energy saving, environment friendliness, favorable reproducibility and the like.