The present invention relates to an online and rapid leakage detecting method for roller hearth type non-oxidation furnace radiating pipes. According to the outline sizes of flange openings in the connecting positions of burning nozzle bodies and waste gas pipes, a sealing gasket which is matched with each flange is made of an asbestos gasket, and an explosion preventing sheet is made of a galvanized iron sheet; after the temperature in a furnace is reduced to room temperature, the waste gas pipes of all burning nozzles are disassembled, and the manufactured sealing gasket and the explosion preventing sheet are installed between a burning nozzle flange and a waste gas pipe flange, and a bolt is tightly screwed; a combustion-supporting fan is started, all the burning nozzles are enabled to be in an igniting state, and the pressure of a combustion-supporting air pipeline system is maintained at 6+/-0.5KPa; a detecting staff enters the furnace, coats and brushes all parts of each radiating pipe by soap water and pays attention to the fact whether the coated and brushed place has bubble emission or not at every moment; and if so, the radiating pipe is proved to have a gas leakage point. The online and rapid leakage detecting method for roller hearth type non-oxidation furnace radiating pipes provided by the present invention can carry out effective, convenient and rapid leakage detection on the roller hearth type non-oxidation furnace radiating pipes with more quantity and tiny damage and breakage points which cannot be effectively detected by naked eyes.