The utility model discloses a jacket heater combustor furnace fired state observation device mainly relates to a viewing device. Including the viewing aperture, the dirt pipe is blown to cyclic annular the ventilation, the observation window, the protection connecting piece, the camera fixing base, high definition digtal camera and monitor computer, the cyclic annular ventilation blows that dirt is intraductal to be equipped with cyclic annular air pipe, be equipped with the air intake on the cyclic annular air pipe, the observation window setting is on the intraductal pipe of dirt face is blown in the ring -type ventilation, be equipped with the annular chamber in the protection connecting piece, high definition digtal camera is fixed to be set up in the camera fixing base, and high definition digtal camera is corresponding with the position of observation window, high definition digtal camera and monitor computer number of pass are according to the line connection. The utility modelhas the advantages of when the natural gas pureness degree that uses when burning was not high, the fine organic glass window inner wall of having avoided viewing aperture department was enclosed dirtyly, the interior circumstances of observation furnace that can be clearer, the real -time supervision long -time to the burning situation that can be more convenient.