Double-sided identical unordered code printing treatment method

The invention relates to a double-sided identical unordered code printing treatment method, which comprises the following steps of: (1) printing image and text parts on the front face and the reverse face of a flat paper sheet through an ordinary offset press, and retaining code-spraying parts; (2) coding all unordered codes, and attaching an ordered code to the rear face of each unordered code on the same printing face or attaching the same ordered code to the rear faces of several unordered codes on the same printing face; (3) carrying out code spraying on the front face of the paper sheet processed in the step (1) according to the ordered codes in the step (2) by using a spray head; (4) carrying out code spraying on the reverse face of the paper sheet according to the ordered codes in the step (2) by using the spray head; and (5) cutting off ordered code parts after finishing spraying. Compared with the prior art, the double-sided identical unordered code printing treatment method has the advantages of simple processing steps, easiness in implementation, great reduction in production cost, and the like.