The invention relates to an aqueous medium coating formula coated on a cold revolving membrane. The formula comprises the following components in percentage by weight: 10-18 percent of styrene monomer, 10-15 percent of acrylic monomer, 2-10 percent of butyl acrylate, 30-40 percent of water, 20-30 percent of alcohol, 0.1-0.2 percent of polydimethylsiloxane and 0.1-0.3 percent of carboxylate anion active agent. The preparation method includes the following two steps: firstly, according to the formula, sequentially adding the alcohol and the water to a stirring drum and stirring for 5-10min at the constant temperature of 25-30 DEG C; and secondly, according to the formula, adding the styrene monomer, the acrylic monomer, the butyl acrylate and the polydimethylsiloxane to the stirring drum and finally wholly stirring evenly for 10-15min. After use, the aqueous medium coating formula leads to high adherence degree between a UV glue layer and an aluminum coated layer, and the content of volatile organic compounds (VOC) in a finished thin membrane reaches the standard.