To provide a method and an apparatus for treating boron-containing wastewater, capable of increasing the adsorption amount of boron by a boron selective adsorbing resin at the time of removal of bron from the boron- containing wastewater even if impurity ions such as sulfate radicals are present in raw water to extent the life of a boron selective adsorbing resin column.

Boron-containing wastewater is passed through the boron selective adsorbing resin column filled with the boron selective adsorbing resin after the concentration of boron thereof is adjusted to 30 mg/l or less and the pH thereof is adjusted to 7.0-9.5 to remove boron.