A printer, especially a device for printing images and characters on a candle includes an inkjet-printing unit. The printing unit comprises a printing bracket on which a printing head is provided. The printing head may reciprocate linearly relative to the printing bracket. Two rotating shafts parallel with each other are arranged below the inkjet-printing unit. At least one of the rotating shafts connects with a driving device. The driving device and the inkjet-printing unit connect with a circuit broad. The device may be used to print golden, silvery, white, and color images and characters on a waxen surface, or used in combination with a computer having a strong image processing functionality to print color images and characters on the candle, meeting an individuation need of a person. The image may be online updated or self defined at all hours according to fashion and vogue.