Abstract: The present invention is an activated carpet cleaning brush, more particularly an activated hairbrush structure including a hair holder and a plurality of U-shape brush hairs. The U-shape brush hairs densely spread over the hair holder and are hard enough to loosen the surface of a carpet that is flattened by stamping and remove the dust and fluff hidden deeply inside the carpet. The smooth tip of the U-shape brush hairs doesn't damage carpet or form a cross resistance against the carpet to hinder the cleaning work. Moreover, the U-shape brush hairs are capable to brush up the fiber of the carpet, and restore the elasticity and softness thereof and produce an overall reactivated effect on the carpet.