Pipeline connecting device and atmosphere preconcentrator

The utility model provides a pipeline connecting device and an atmosphere preconcentrator, the pipeline connecting device comprises a joint body, one end of the joint body is communicated with a connecting pipeline of equipment, and the other end of the joint body is communicated with an external pipeline; the first locking piece is connected with one end, close to the connecting pipeline, of the joint body; the first sealing piece is arranged on the connecting pipeline in a sleeving manner, and the first sealing piece can be pressed between the first locking piece and the joint body after the first locking piece is connected with the joint body; the limiting baffle is movably connected to the equipment, and the limiting baffle can be detachably connected with the connector body after moving to a locking position; the problem that in the prior art, due to the fact that a connector body and a connecting pipeline are prone to disengagement, the stability of transmission between pipelines is reduced is solved. A