A surface treatment apparatus (100) comprises a transporting device (20), a planishing device (30) and a driving device (10). The transporting device comprises a base (21). The base comprises a front portion (212), a rear portion (214), and a pair of parallel middle portions (216) each comprising a slideway, which defines an opening therein. The base still comprising a sliding block (26) received in the opening (218), with two sides of the sliding block respectively slidably received in the slideways in the pair of middle portions. The planishing device comprises a pair of mounting blocks (32) fixed on the sliding block, at least one axle (34) fixed between the mounting blocks, and at least one wheels (342) fixed on the axle. The driving device is used for driving the sliding block to slide in the opening.