The invention provides a high-efficiency base metal complex metal pickling corrosion inhibitor and application thereof, and belongs to the field of metal pickling corrosion and protection. The corrosion inhibitor is a base metal complex and has the advantages of being simple in synthesis, easy to purify, low in cost, environment-friendly, non-toxic, high in efficiency and stable in corrosion inhibition. The high-efficiency base metal complex metal pickling corrosion inhibitor can be used for pickling corrosion of metal, has a wide application range and has good corrosion inhibition performance. Meanwhile, the corrosion inhibitor can better withstand changes in cleaning conditions, and particularly has the advantage of the stable corrosion inhibition performance. In addition, the corrosioninhibitor also has the advantages of being environment-friendly, non-toxic, simple in synthesis and low in cost, has high application value and is worthy of large-scale application and promotion.