Vacuumizing pipeline connecting device

The utility model relates to the technical field of pipeline connection, in particular to a vacuumizing pipeline connecting device which comprises a connecting pipe, a concave disc is fixedly connected to one end of the connecting pipe, springs are symmetrically arranged on the four sides of the inner wall of the end, away from the connecting pipe, of the concave disc, and arc-shaped clamping blocks are fixedly connected to the other ends of the springs. Through cooperative arrangement of structures such as a concave disc, a spring and arc-shaped clamping blocks, during use, one end of a connecting pipe is connected with vacuumizing equipment, then the arc-shaped clamping blocks can move back and forth through the spring, pipelines of different specifications can be placed among the four arc-shaped clamping blocks, and then the pipelines of different specifications can be clamped. And then one end of the pipeline is attached to the concave disc, gas leakage caused by gaps is prevented, meanwhile, the arc-shap