Water-base oil dirt cleaning agent and preparation method thereof

The invention discloses a water-base oil dirt cleaning agent and a preparation method thereof, wherein the water-base oil dirt cleaning agent has the characteristics of being strong in cleaning capability, excellent in biodegradation, low in preparation cost, environmentally-friendly, efficient and the like, and is specifically suitable for cleaning heavy oil dirt on the road pavement. The water-base oil dirt cleaning agent consists of the following components in weight proportion: 2-7% of anionic surfactant, 2-8% of nonionic surfactant, 1.5-3% of triethanolamine, 1-3% of trisodium citrate and the balance of water, wherein the anionic surfactant is preferably selected from two or three of alpha-vinyl sodium sulfonate (AOS), sodium dodecyl benzene sulfonate (LAS) and sulfonate of fatty acid methyl ester ethoxylate (FMES); and the nonionic surfactant is preferably selected from one or two of fatty alcohol-polyoxyethylene ether (AEO-9) and cocamidopropyl betaine (CAB).