Abstract: A X-ray film packaging bag printer is disclosed. A positioning detection device is arranged above a conveyor belt, positioning holes in an X-ray film packaging bag strip are detected by the positioning detection device, and positioning can be performed by only using adjacent two positioning holes. According to the X-ray film packaging bag printer, the accuracy of the positioning detection device can be improved, the parameter conflict with a set length of a machine can be avoided, that is, the problem of shutdown or hop printing caused by a detection error are effectively avoided; the printing stability and reliability of the X-ray film packaging bag printer are improved; the structure is simple; a printing process is integrated; the automation efficiency is high; the manual operation is reduced; the production efficiency is greatly improved; the production cost is low; the user experience is improved.