The invention relates to the technical field of supporting, paper feeding or paper guiding devices, and particularly to a printer which comprises a printer body and an ink box, wherein an insertion hole in which the ink box to can be inserted is formed in the printer body; the ink box is divided into an upper part, a middle part and a lower part which are connected in sequence; an elastic expansion layer is arranged at the middle part; a fixing part capable of preventing the upper part from compressing the middle part is arranged on each of the two sides of the lower part; an ink nozzle is arranged at the lower part; an air bag is arranged on the edge of the ink nozzle; a pressing part capable of inflating the air bag is arranged at the upper part. According to the printer provided by the invention, not only can the ink box be taken down from an inkjet printer, but also ink in the ink box can be prevented from flowing out of the ink nozzle.