The invention provides a barcode printing system. The barcode printing system comprises an information input part, a printing matter input channel and a printing head, wherein the information input part is used for inputting a pattern needing to be printed; the pattern comprises a barcode needing to be printed; the printing matter input channel is used for providing a printing matter needed by a printing pattern; the printing head is used for printing ink on the printing matter; different barcode printing manners are set according to a barcode direction so that the width of the generated barcode is accurate and the quality of the barcode can be improved, and furthermore, the decodability of the barcode is improved.