Harmful gas decomposer

The utility model discloses a harmful gas decomposer, which is designed for eliminating hidden hazard of gas explosion or carbon monoxide poisoning in a coal mine roadway. The harmful gas decomposer comprises an anti-reflux explosion-proof sealing casing, and a sensor unit, a control device and a mixed gas decomposing device are disposed inside the anti-reflux explosion-proof sealing casing. The sensor unit for monitoring methane concentration in air outputs monitoring data, the control device for receiving the monitoring data sent from the sensor unit outputs decomposition starting signals according to preset programs, the mixed gas decomposing device includes a mixed gas decomposition bin, a gas suction hole, a gas discharge hole and an ozone generator, the gas discharge hole is provided with a draft device, a gas output end of the ozone generator is communicated with the mixed gas decomposition bin, and the draft device and the ozone generator are started according to the decomposition starting signals sen