A heading machine includes a base unit (1), a delivery unit (2) arranged on the base unit, two holding units (3) arranged on the base unit, a drive unit (4) arranged on the base unit, a cutting unit (5) arranged on the delivery unit, a computer control unit (6) arranged on the base unit, and a power supply (7) electrically coupled to the drive unit, the cutting unit and the computer control unit to provide an electric power. Thus, the computer control unit adjusts the length of the lace (8), so that the tension of the lace is distributed evenly, and the lace that has been cut will have a constant length. In addition, the cut length of the lace is adjusted without needing manual measurement and adjustment.