Printing mechanism of flexo printing machine

The utility model discloses a printing mechanism of a flexographic printing machine, which belongs to the technical field of printing mechanisms, and comprises a printing machine main body, a sliding rod, a mounting block, rotating rods and an ink roller, the ink roller is arranged in the middle of the printing machine main body, the rotating rods are buckled on two sides of the ink roller, the rotating rods are fixed on the mounting block, and the mounting block is connected with the printing machine main body through the sliding rod. The surface of the ink roller is sleeved with a plurality of sets of sleeve rollers, traction blocks are fixed to the sides, attached to each other, of the sleeve rollers and the ink roller, the surfaces of the traction blocks are sleeved with traction grooves formed in the ink roller, and the ends of the two sides of the ink roller are rotationally connected with limiting plates. An operator can conveniently replace the sleeve roller on the back face of the ink roller, due to