The utility model provides an impression cylinder of a code spraying printing machine. The device comprises a cylinder body, wherein the cylinder body is sleeved on a rotating shaft; wherein two trapezoidal grooves are symmetrically formed in the outer wall of the cylinder body in the axial direction, one side wall of each groove is connected with the outer wall of the cylinder body through a transition inclined plane, the transition inclined planes and the outer wall of the cylinder body form a first intersecting line, and the transition inclined planes and the side walls form a second intersecting line; wherein a plurality of gripper sheets are uniformly arranged on a mounting shaft of the gripper row; the tooth pads are installed on the side walls of the grooves along the second intersecting lines, and the tooth pads abut against the gripper pieces one by one and are tightly attached to the gripper pieces. According to the utility model, the radius of the cylinder body is increased,and the transition inclined surface is arranged, so that the thickness mounting area of the gripper sheet is increased, grippers and paper are prevented from being scraped with the nozzle, the working stability and overprinting precision of the ink-jet printer are improved, and the effective productivity and the finished product percent of pass are improved.