A water-based metal cleaner

The invention relates to the daily chemical field, in particular to a cleaning agent. A water-based metal cleaning agent comprises the following components in percentage by weight: 2-5% of a zwitterionic surfactant; 2-7% of a non-ionic surfactant; 1-3% of a corrosion inhibitor; 0-1% of a defoaming agent; 4-9% of sodium phosphate; 0.5-3% of sodium tripolyphosphate; 2-6% of trisodium phosphate; and a solvent added to 100%. By taking a mixture of novel organic surfactants, coconut oil fatty acyl diethanol amine and coconut oil fatty acyl diethanol amine phosphate ester as an emulsifier for compounding, the water-based metal cleaning agent provided by the invention is endowed with great dispersing and anti-staining capabilities, and makes up the deficiency of the prior art. In a normal-temperature state, the water-based metal cleaning agent has a high dissolving capacity for various oils, and can dissolve heavy oils and age deteriorated oils. The water-based metal cleaning agent can remove saponifiable oil stains as well as unsaponifiable oils, and can prevent oil stains removed from a workpiece from staining a metal surface.