Printing technology for bar codes

A printing technology for bar codes sequentially comprises the following steps that (1), a bar code printing area of a paper printing surface is flattened; (2), white electrochemical aluminum is adopted to carry out hot stamping on the bar code printing area, and a hot stamping transfer layer covering the bar code printing area is formed; and (3) black ink is used for printing the bar codes on the hot stamping transfer layer. The printing technology of the bar codes is particularly suitable for printing the bar codes on paper with the irregular surface, and the detection grade of the bar codes can be effectively improved. By the adoption of the printing technology for the bar codes, the bar codes are printed on original ecology paper like paper with the irregular surface, the detecting grade is larger than 2.6, studying and reading are easy, and the printed bar codes are stable in quality.