Code spraying printing machine

The utility model relates to the technical field of ink-jet printing machines, and discloses an ink-jet printing machine which comprises a U-shaped plate and a conveying device used for conveying packaging boxes, the U-shaped plate is erected outside the conveying device and fixedly connected with the ground, an air cylinder is fixedly arranged on one side of the U-shaped plate, a first through hole is formed in a top plate of the U-shaped plate, and a second through hole is formed in the top plate of the U-shaped plate. The output end of the air cylinder penetrates through the first through hole and is fixedly connected with a mounting plate, a code spraying head is fixedly arranged on the lower surface of the mounting plate, a plurality of electric heating plates are fixedly arranged on the rear side of the code spraying head, a code spraying machine body is fixedly arranged at the top of the U-shaped plate, and an adjusting mechanism is arranged in the U-shaped plate. Second through holes are formed in the