Abstract: Disclosed is a hot air circulating system for printing press, which comprises a plurality of primary air blowers and a plurality of primary heating devices connected at air suction openings of the primary air blowers. Air blowing openings of the primary air blowers are in communication with printing presses through primary air blowing passages, primary air suction passages are connected between the primary heating devices and the printing presses, and the primary air suction passages are provided thereon with a plurality of air discharging passages. With the disclosure, losses of thermal energy are effectively reduced, thin films are prevented from being deformed due to temperature shock, thus improving the rate of finished products and reducing pollution caused to production workshops.