The invention discloses a plate polishing machine which comprises a rack 1, a conveying tabletop 2, polishing rooms 3 and motors 6. The conveying tabletop 2 is arranged on the rack 1, the polishing rooms are arranged at the upper end of the conveying tabletop 2, the position, on one side of each polishing room 3, of the rack 1 is provided with the corresponding independent motor 6, and the other side of each polishing room 3 is provided with an installation shaft 7. Polishing rollers 12 are arranged in the polishing rooms 3, and the polishing rollers 12 are connected between the motors 6 and the installation shafts 7. The width of the conveying tabletop 2 is 600 mm to 700 mm, any side of the rack 1 is provided with a power distribution cabinet 10, and a digital display 4 is arranged on the power distribution cabinet 10. According to the plate polishing machine, the polishing width is increased, the higher machining efficiency is obtained at the same machining speed, a release bearing is used for control, replacing of the polishing rollers is facilitated, meanwhile, the digital display is arranged, and the polishing intensity can be mastered more conveniently.