Precision calibration method for length of printed labels

The invention relates to the technical field of printers, and discloses a precision calibration method for length of printed labels. The precision calibration method comprises the following steps of: setting test print length of a printer, calculating pulse number of a total signal for controlling a motor to move according to dot spacing and subdivision driving number of the step motor, comparing label length practically printed by the printer with standard length, calculating a difference value, and controlling the step motor to not act after signal pulse with a specific sequence number is emitted if the difference value is greater than 0; and controlling the step motor to act twice after the signal pulse with the specific sequence number is emitted if the difference value is smaller than 0. The precision calibration method for the length of the printed labels disclosed by the invention greatly reduces printing errors of a label printer, adopts an interpolation or extraction mode for motor action if the step