Ternary copolymerization flocculating agent based on natural macromolecules and preparation method for ternary copolymerization flocculating agent

The invention relates to a ternary copolymerization flocculating agent based on natural macromolecules and a preparation method for the ternary copolymerization flocculating agent, and belongs to the technical field of organic macromolecule materials and water treatment flocculating agents. The ternary copolymerization flocculating agent is a flocculating agent which is formed by chitosan of acrylamide-grafted copolymerization cation and lignin or fulvic acid of anions. The ternary copolymerization flocculating agent based on natural macromolecules prepared by the preparation method disclosed by the invention is powdered, almost white in color and slightly brown. The flocculating agent has the characteristics of anions and cations, has the advantages of being low in price and environmentally friendly, and has good flocculating effects on electroplating wastewater, dyeing wastewater, municipal sewage, montmorillonite suspension and the like.