The present invention relates to a method for removing metal ions in the phosphoric acid solution, and particularly to a method for removing metal ions in the phosphoric acid solution which comprises a step of passing an ion exchange resin through the acid solution to activate the ion exchange resin; a step of filling a resin tower with the activated ion exchange resin and washing it with ultra-pure water, and a step of passing the phosphoric acid solution to the washed ion exchange resin, thereby causing each individual concentration of metal ions with the oxidation number of 2 to 7 in the phosphoric acid solution to be less than 100 ppb.