The invention discloses an intelligent cleaning factor for an oil detergent and a preparation method thereof. The intelligent cleaning factor is prepared from the following raw materials under the action of an oxidant: highly reactive polyisobutylene (PIB) with a molecular weight of 680, diethylenetriamine, polyether polyol (GP-306) with a molecular weight of 600 and synthetic base oil PAO2; the oxidant is di-tert-butyl peroxide. The synthesis method has the advantages of mild reaction process and conditions, simple operation, high yield and few by-products, as well as high purity and stable performance of an obtained product.