The invention discloses a numbering machine and print wheels. The numbering machine comprises an enclosure, a print wheel group comprising a plurality of print wheels, a positioning mechanism and a carry mechanism, wherein intermediate shafts are respectively arranged at two ends of the enclosure; the print wheel group can be pivotally arranged on the intermediate shafts; the positioning mechanism is used for positioning the print wheel group at the proper position; the carry mechanism comprises carry teeth corresponding to the print wheels which are used for realizing the carry of the print wheels; the print wheels are provided with carry ports; and the contact mode between the carry teeth and the corresponding carry ports of the print wheels is a rolling mode between circular arcs. According to the numbering machine and the print wheels disclosed by the invention, the structures of the print wheels and the carry teeth of the numbering machine are improved so as to achieve the aims of flexibility and reliability in carry.