A guide-cutting sheet of a cutting wheel for a paper shredder is characterized in that two sides of a centerline of a planar linear guide-cutting sheet are opened respectively with blade shaft transfix holes corresponding to a spacing between the blade shafts of two parallel cylindrical rotary cutting wheels; below or above two blade shaft transfix holes are opened respectively with fixing rod transfix holes, corresponding to a spacing between two fixing rods; the centerline part above two blade shaft transfix holes is opened with a rabbet which can be latched at two aperture walls of a strip-shape aperture on a face cover; and a bottom of the rabbet is provided with a concaved knife-edge which can cut off paper sheets.