The utility model relates to a feeding sealing device, in particular to feeding sealing device who is applicable to the high -temperature tubular furnace flange. The device includes that boiler tube,flange terminal surface, feeding are colluded, sealed block, and pipeline, pressing mode opening etc. Are colluded in protection air pipe, feeding. Feeding of design is colluded in the tube -like stove furnace chamber, is equipped with the scale on the straight -bar that the feeding was colluded, can adjust the crucible position according to the heating warm area of tube -like stove, to the pyrolysis process of volatile material, realize the sealed then very crucial of feeding in the boiler tube business turn over activity of colluding, the pressing mode pipeline opening sealing device of my design, the device be in the straight venturi tube way of pipeline is colluded in the feeding full high temperature resistant rubber sealing material to at pressing mode opening of the terminal designof pipeline, carry out the feeding when loosening or get the material operation, seal in order realizing when compressing tightly. The device is simple in structure and convenient to operate, the business turn over activity of colluding the feeding has realized high -efficient sealedly.