The invention relates to a planetary wheel type flexible abrasive disc. The planetary wheel type flexible abrasive disc comprises a shell body, wherein the shell body is defined by a base plate, a top plate, a left side plate and a right side plate, a first hole and five second holes are formed in the top pate, five third holes are formed in the base plate, an abrasive disc set is fixed in the shell body, and four clamping wheels are evenly arranged between the shell body and the abrasive disc set; the abrasive disc set comprises an inner gear ring, a driving gear and driven abrasive bundles, a motor is arranged over the driving gear, the motor is fixed on the top plate, a shaft of the motor penetrates through the first hole to be fixedly connected to the driving gear, driven gears are arranged on the upper portions of the driven abrasive bundles respectively, square grooves are formed in the lower ends of the driven abrasive bundles respectively, a baffle ring is arranged at the lower end of each square groove, a square cleaning rod is arranged in each square groove, an end block is arranged at the upper end of each cleaning rod and is clamped in the corresponding square groove, the lower end of each cleaning rod penetrates through the corresponding third hole and is provided with an abrasive brush, and the lower portion of each cleaning rod is sleeved with a compression spring. According to the planetary wheel type flexible abrasive disc, self-adaptation can be achieved according to the shape of a part to be polished, polishing area is large, and polishing efficiency is improved.