A dust-containing gas treatment apparatus includes a cylindrical treatment room configured to introduce gas containing dust and remove the dust from the gas, a catcher including a brush with hair planted in a support in the cylindrical treatment room and configured to catch the dust contained in the gas, a liquid sprayer in the cylindrical treatment room, a rotary driver configured to rotate the catcher and a stirrer, a gas introduction portion configured to introduce the gas containing the dust, a gas discharge portion configured to discharge the gas and the removed dust from the cylindrical treatment room, and a liquid discharge portion configured to discharge a liquid containing the removed dust.