Chemical milling solution applicable to environment-friendly water-based strippable coating and preparation method and application thereof

The invention relates to a chemical milling solution applicable to an environment-friendly water-based strippable coating and a preparation method and application thereof, and belongs to the technical field of chemical milling. The chemical milling solution comprises sodium hydroxide of 200-300 g/L, sodium sulfide of 30-50 g/L, triethanolamine of 2-3 mL/L, hexamethylenetetramine of 1-2 g/L, sodium metaaluminate of 1-3 g/L, Tamol NN9401 of 0.1-0.3 g/L, ethylenediamine tetraacetic acid disodium of 0.2-0.5 g/L and octadecyl trimethyl ammonium chloride of 0.2-0.3 g/L, and water serves as a solvent. The chemical milling solution avoids the phenomenon that leakage corrosion and penetration corrosion of the environment-friendly water-based strippable coating occur easily in the chemical milling process of traditional chemical milling solutions, enables the chemical milling rate of aluminum-copper alloy to be high, the surface smoothness of the aluminum-copper alloy to be high and operation to be easy in the chemical milling process, and is easy to apply and popularize.