The utility model discloses a sealed-off device of an exhaust pipe and a vacuum pipe. The sealed-off device comprises a vacuum equipment, and sealed-off lamp caps arranged at two sides of the exhaust pipe; the vacuum pipe is provided with an exhaust hole that is connected with the exhaust pipe; the internal sides of the sealed-off lamp caps at two sides, facing to each other, are provided with air outlets; and the sealed-off lamp caps are connected with an air passage pipeline. The sealed-off lamp caps are connected with traction equipment. The sealed-off lamp caps are provided with air adjusting switches. The vacuum equipment is provided with more than two exhaust holes; and the exhaust holes are provided with the sealed-off lamp caps correspondingly. The lamp caps are a flat type or a fine type. The exhaust pipe is provided with a supporting frame that can move up and down. By adopting the sealed-off device, two sides of the vacuum pipe and the exhaust pipe are heated simultaneously, the sealed-off rate is improved, the uniform heating of the exhaust pipe is ensured simultaneously as the lamp caps move to and fro, the mechanization is convenient for realization, the operation is simple and convenient, the production process can be controlled better, the consistency of the product can be ensured, and the production efficiency is improved.