A suction brush of a vacuum cleaner for both vacuum cleaning and steam cleaning is provided. The suction brush includes a brush main body connected to a cleaner main body; a steam generating unit for heating water being supplied from a water storage tank mounted on the brush main body and spraying steam generated by heating the water on the surface to be cleaned; a turbine fan, installed in the brush main body, for generating a rotating force by the drawn-in air that flows into the brush main body; a power transfer unit for being driven by the rotating force of the turbine fan; and at least one pair of duster rotating plates, arranged on a lower part of the suction brush, for being rotated by power being transferred through the power transfer unit.