The utility model discloses an oxygen index (OI) apparatus with pitch burning smoke concentration detects function, including setting up the host computer and burning appearance on the base, be provided with the sensor of connection control unit in the burning appearance, the sensor is arranged in the host computer, the combustion parameter in the burning appearance can be controlled to the host computer, and show on the display through the gaseous data transmission in burning back in the sensor collection burning appearance, the fire behaviour of pitch not only can be appraised to this device, and can survey the concentration that the pitch burning produced harmful gas, thereby know the feasibility that pitch is used for the tunnel road surface comprehensively, the multi -functionalization of oxygen index (OI) apparatus is realized to this device, the data that make the test are more.