The utility model discloses a CO heating device which is a gas heater suitable for working in an explosive environment and a dangerous environment with a danger zone divided into 22 dust zones and 2 gas zones. The CO heating device is characterized by comprising a heating device housing, a flange cover for covering a flange hole of the heating device housing, an outer protection pipe fixed to the flange cover, a U-shaped heating body sleeve pipe arranged in the heating device housing, an anti-explosion wiring box heating body fixedly connected to a port of the protection pipe, and an electric heating body penetrating the outer protection pipe and the heating body sleeve pipe to be connected with the wiring end of an anti-explosion wiring box. The CO heating device can work in the explosive environment and the dangerous environment with the danger zone divided into the 22 dust zones and the 2 gas zones, and can be used for continuously heating CO for more than 18,000 hours.