To provide a fluorine-containing polymer solution having excellent storage stability and suitable for various kinds of coating applications, etc.

This fluorine-containing copolymer solution having excellent storage stability is obtained by dissolving a fluorine-containing copolymer containing an olefinic monomer having a hydrolyzable silyl group, a (meth) acrylate ester and a fluoroolefin as essential monomer components in an organic solvent, and has a fluoride ion concentration of ≤100 ppm and a chloride ion concentration of ≤100 ppm, respectively, based on the solid content of the fluorine-containing copolymer on a quantitative analysis by an ion chromatograph method.