Phosphorus-containing terpolymer and preparation method thereof

The invention discloses phosphorus-containing terpolymer and a preparation method thereof. The phosphorus-containing terpolymer is prepared by copolymerizing phosphorus-containing monomer A, zwitterion monomer B and carboxylic monomer C. Due to good wetting performance, solubilizing performance, descaling performance, coagulation delaying performance and surface activity, the water-soluble polymer can be used for chemical fiber, plastic, paint, petroleum, ceramic, biological medicine, washing auxiliaries and cement-based material additives.