The invention discloses a synthesis method of acrylic emulsion for industrial antisepsis, which comprises the following steps: at first, adding 40 to 50 percent of unsaturated fatty acid, 10 to 20 percent of coconut oil fatty acid,10 to 20 percent of glycerin and 10 to 20 percent of DEG into a reaction kettle to be esterified to obtain alcohol acid prepolymer; and adding 5 to 10 percent of the alcohol acid prepolymer, 1.5 to 3 percent of emulsifier and 40 to 50 percent of deionized water into the reaction kettle, rising temperature to 90 degrees centigrade, adding 12 to 16 percent of methyl methacrylate, 15 to 20 percent of n-butyl acrylate, 10 to 14 percent of styrene, 0.5 to 1.5 percent of methacrylic acid and 1 to 2 percent of silane coupling agent, keeping the temperature for one hourand then cooling to 40 DEG C, and after PH value is adjusted to 7 to 9, discharging is started. The invention is used to be anticorrosive paint and the comprehensive cost is low. Because organic solvent is almost zero, the invention is more environment-friendly and the performance thereof almost reaches the level of long oil alkyd.