This series of products for circulating water efficient non phosphorus green environmental protection type multi scale inhibitor, composed of phosphorus free organic acid polymer compound, has good performance of corrosion and scale inhibitor, is an environmentally friendly organic polymer is safe and nontoxic, biodegradable. This product also has a certain corrosion inhibition, good compatibility with fluorine, and other drugs with good compatibility. On the water, calcium carbonate, calcium sulfate, barium sulfate, calcium fluoride and silicon scale has good dispersion scale, scale inhibition performance is better than the commonly used organophosphate inhibitors. The utility model has the advantages of good biodegradability and wide application range, and is suitable for the cooling water system with high alkali, high hardness and high PH.