The invention discloses a control method of a printer and the printer. The printer comprises a first sensor, a printing head and a second sensor, which are successively set in a transmission channel of the printer. The control method comprises steps of detecting whether the first sensor is provided with paper; when the first sensor is provided with the paper, detecting whether the second sensor is provided with paper; when the second sensor is provided with the paper, controlling the printing paper to be withdrawn so as to allow the paper head of the printing paper to reach a detection position of the second sensor; and when the second sensor is not provided with the paper, controlling the printing paper to be fed so as to allow the paper head of the printing paper to reach the detection position of the second sensor. According to the invention, a problem of paper waste caused by improper installation positions of the paper during a printing process of the printer in the prior art can be effectively solved and it is ensured that positions on the printing paper of printed contents are quite precise.