The invention discloses a cleaning process for value adding utilization of nickel-contained pyrite burning slag. The process firstly performs efficient leaching for the nickel-contained pyrite burning slag to obtain leaching liquid and leaching slag containing iron and nickel; and then, the sacrifice anode electric reinforcing reduction purification is performed for the leaching liquid, so that impurity elements in the leaching liquid are deeply reduced into reduction purification slag through an electric reinforcing reduction method. The process realizes the value adding utilization of the pyrite burning slag. A new technological process is a closed cycle, and a leaching agent can be recycled, so that the cleaning process preferably solves such problems as heavy pollution and low metal recovery rate generally generated in a traditional pyrite burning slag treatment process, is suitable for treating other various wastes containing iron and nickel, and has the prominent advantages of high adaptability to raw materials, simple technological process, high recovery rate of valuable elements, cleanness and environmental protection.