Multi-channel variable-pitch pipetting device for full-automatic cup separation treatment system

According to the multi-channel variable-pitch pipetting device for the full-automatic cup separation treatment system, two pipettor bases which are adjacent left and right are connected through a flexible belt, and the pipettor bases located on the leftmost side and the pipettor bases located on the rightmost side are driven by a driving part to reversely move in the left-right direction; when the flexible belt between the two adjacent pipettor bases in the left-right direction is straightened, the distance between the pipettor gun heads connected with the pipettor heads in an inserted mode is the largest, the pipettor gun heads can be suitable for multi-channel liquid suction and liquid adding operation of a screw sample tube, and the pipettor bases located on the leftmost side and the rightmost side are driven by the driving component to relatively move in the left-right direction. When the pipettor bases abut against each other, the distance between the pipettor gun heads connected with the pipetting heads