The invention provides a release film slitter which comprises a rack, a slitting table, a drive motor, a controller, a film roll, a guiding roller, guiding wheels, a flattening shaft, a deviation correcting mechanism, a cutter, a moving rail, a scaleplate, a scaleplate adjuster and a collecting box. The slitting table is horizontally and fixedly arranged on the rack. The film roll and the guiding roller are arranged on the front portion of the rack through a supporting frame. The drive motor is arranged on the lower portion of the rack. The two sets of guiding wheels are arranged on the front portion of the slitting table, and the flattening shaft is arranged between the two sets of guiding wheels. The deviation correcting mechanism is arranged in the middle of the slitting table. The cutter is arranged on the rear portion of the slitting table. The scaleplate and the moving rail are arranged on the two sides of the portion, behind the cutter, of the slitting table, and the scaleplate adjuster is arranged at the tail end of the scaleplate. The collecting box is arranged behind the rack. The controller is fixedly arranged under the middle of the slitting table. The release film slitter is easy to operate, accurate in slitting and high in work efficiency due to automatic control.