The invention provides a glass cleaning agent. The glass cleaning agent is prepared from potassium hydroxide, sodium hydroxide, potassium carbonate, an anion ion surfactant, a non-ionic surfactant, a chelating agent, an alcohol ester type organic solvent, a solubilizer and water. Compared with the prior art, the glass cleaning agent has the advantages that the alkalinity is weak, and the wetting property is strong; under the mutual matching of components, the surface of cleaned glass is smooth, stubborn dirt can be removed, the damage to a glass surface layer is avoided, a defective rework procedure is reduced, and the machine and labor cost and the material cost are effectively reduced; the fine scratching of the glass surface is reduced, the fuzziness and bluing of the glass surface are avoided, the surface can be quickly flushed and cleaned, the residue is avoided, the rinsing frequency is reduced, the components can be completely decomposed, the pollution to environment is avoided, and the glass cleaning agent is suitable for glass heat-bending mobile phone front and back cover plates.