Polyacrylamide emulsion is widely used in various fields such as domestic sewage, chemical wastewater, oilfield sewage, sludge dewatering treatment, and papermaking. Polyacrylamide water-in-oil emulsion is also widely applied in the treatment of municipal domestic sewage, as well as wastewater from breweries, starch factories, food processing plants, etc. It is particularly suitable for the flocculation and sedimentation of organic suspended solids in acidic or weakly acidic sewage. In the papermaking industry, it is used as a retention and drainage aid, and for the treatment of papermaking wastewater. In the petroleum industry, it can be used as an oil remover.