High-temperature-resistant high-vacuum interface capable of conveniently realizing rigid-flexible conversion

The invention discloses a high-temperature-resistant high-vacuum interface capable of conveniently realizing rigid-flexible conversion. The high-temperature-resistant high-vacuum interface capable of conveniently realizing rigid-flexible conversion comprises a mouthpiece, a flange for fixing the mouthpiece, a connecting piece, a corrugated pipe, a clamping seat and a fastening screw, the lower end of the connecting piece is hermetically fixed on the flange, the bottom of the mouthpiece is provided with a mouthpiece base, the two ends of the corrugated pipe are respectively and fixedly connected with the upper end of the connecting piece and the mouthpiece base of the mouthpiece in a sealing manner; and the clamping seat comprises at least two clamping seat units, and the upper ends and the lower ends of the at least two clamping seat units can be detachably clamped and fixed to the upper end of the connecting piece and the periphery of the mouthpiece base respectively. Rigid-flexible conversion of the interfa