Provided are: a method for producing a coating solution for metal oxide coating whereby ample hardness is obtained even at low-temperature firing and without involving a solvent substitution step, and which possesses favorable printability and in-plane uniformity in flexographic printing; a coating solution for metal oxide coating thus produced; and a metal oxide coating. The method for producing a coating solution for metal oxide coating, the method being characterized in including: a first step for hydrolyzing a first metal alkoxide in the presence of a metal salt and organic solvent to obtain a first-step solution; a second step for adding to the first-step solution a second metal alkoxide of lower reactivity in comparison with the first metal alkoxide, and hydrolyzing/condensing to obtain a second-step solution; and a third step for adding a precipitation inhibitor to the second-step solution.
