The present invention provides a polymerization method for acrylic latex without emulsifier, in which a reaction system is formed from 40˜60 wt % of pure water and 2˜9 wt % of carboxylic acid monomers with carbon-carbon double bond polymerizable functional groups (A), and 40˜50 wt % of methyl methacrylate or acrylate monomers (B), and 0.2˜2.0 wt % of inorganic alkaline solution is first used to adjust the pH value of the reaction system to within a pH range of 9.0˜13.0, then 0.2˜1.0 wt % of peroxide sulfates are used as initiators, and emulsification polymerization is carried out. At the end of the reaction, organic amine compounds are used to adjust the pH value of the obtained aqueous resin latex to within the pH range 7.0˜9.5. Particle diameters of the manufactured aqueous resin latex are approximately 100˜30 nm, uniformly distributed and have excellent outward appearance. Moreover, acid value is low at 3.5˜6.5 mgKOH/g, and Its specific gravity is approximately 1.07, slightly greater than that of water; storage stability is excellent, with good permeability that facilitates construction. Moreover, water resisting property as a dry film coating is good, tensile strength is excellent, and provides superior abrasion performance.