Reverse osmosis membrane scale inhibitor and preparation method thereof

The invention provides a reverse osmosis membrane scale inhibitor and a preparation method thereof. The reverse osmosis membrane scale inhibitor is prepared mainly by organic phosphonic acid and/or a phosphino-carboxylic acid compound, quadripolymer, isothiazolinone and deionized water. The scale inhibitor comprises main components including acrylamide, sulfonate, acrylic ester and maleic anhydride quadripolymer, wherein the copolymer contains multiple functional groups and has very good scale inhibition and dispersion functions on different fouling substances, and tests prove that the scale inhibitor has a protection function on CaSO4, CaCO3, SiO2, CaF2, BaSO4, SrSO4, Ca3(PO4)2 and bacterial fouling.