The invention relates to a harmonic ingredient of high-power clean diesel oil, which is prepared by a cetane accelerant, a pour point depressant, a wear-resistant lubricant, a detergent dispersant, an oxidation stabilizer, a cosolvent and the like. The harmonic ingredient is based on improving the quality of the diesel oil, increasing the oil yield and reducing the production process, integrates assistants required in a harmonic process of the diesel oil, has the functions of reducing coagulation, increasing the cetane number of the diesel oil, improving lubrication and oxidation stability, cleaning efficiently and resisting static electricity, is non-toxic, free from heavy metal, low in addition and convenient to use, and can increase the power of the diesel oil greatly, reduce hazardous substance discharge of an automobile and reduce engine noise; the product quality is stable, the production process is simplified, the production and detection costs are lowered, and the mutual effect is controllable during production of an oil refinery; the quality of an oil product can be improved greatly for a refinery enterprise; and the benefit is improved.