Offset printing device of double-sided color rotary offset press

The offset printing device comprises a main body and a printed matter, a discharging opening is formed in the position, close to the middle, of one side of the main body, an in-out opening is formed in the side, away from the discharging opening, of the main body, a collecting box is slidably connected to the bottom end of the interior of the main body, and a supporting plate is fixedly connected to the inner wall of the main body; a fixing plate is fixedly connected to the end, close to the supporting plate, of the inner wall of the main body, and a second connecting shaft is fixedly connected to the position, close to the discharging port, of the inner wall of the main body. And the two cleaning brushes are arranged to effectively clean the surfaces of the printed matters, and through the arrangement of the air blower, air blown out by the air blower further treats dust on the surfaces of the printed matters, so that the cleaning effect is improved, the phenomenon that the treated dust is still left on the