Anionic emulsion flocculant is obtained by dispersion method or inverse emulsion polymerization method, product dissolution rate is very fast, is the liquid form of polyacrylamide liquid. It has the characteristics of solid flocculant, adsorbing suspended solid particles in water through polar groups in molecular chain, so as to bridge or electrically neutralize particles to form large flocculants. The product is polymerized in emulsion form at room temperature.