Acid corrosion and scale inhibitor has good chelating and dispersing effect on calcium carbonate, calcium sulfate and calcium phosphate in water, and has good corrosion inhibition effect on carbon steel and copper. Corrosion and scale inhibitor is mainly used in circulating cooling water system, such as power plant, chemical plant, petrochemical, steel and other circulating cooling water system. The corrosion inhibition effect of our product is good and has very strong scale inhibition.