Novel corrosion and scale inhibitor

The invention discloses a novel corrosion and scale inhibitor consisting of tungstate, an organic phosphate agent, a copper corrosion inhibitor, sodium hydroxide and water. According to a weight ratio, the novel corrosion and scale inhibitor comprises 7 parts of the organic phosphate agent, 260 parts of the tungstate and 0.5 part of the copper corrosion inhibitor, and the pH value of the novel corrosion and scale inhibitor is adjusted to be more than 7 by using sodium hydroxide. The invention provides a corrosion and scale inhibitor with a new formula and a method for preparing the corrosion and scale inhibitor. In an open type circulating cooling water system, the usage amount of the tungstate is reduced to prolong the service life of equipment. Meanwhile, pollution discharge operation is avoided to reduce waste of a water source. The novel corrosion and scale inhibitor is prepared by compounding tungstate and organic phosphate, the synergistic effect between tungstate and organic phosphate is used for achieving a purpose of corrosion inhibition, and the corrosion inhibition rate is smaller than a national carbon steel specified value of 0.075mm/a.