Detection device for parallelism of machine tool large stand column perpendicular guide rail relative to rotation axis of workbench

The utility model discloses a detection device for the parallelism of a machine tool large stand column perpendicular guide rail relative to the rotation axis of a workbench. The detection device comprises an installation rod and a gauge stand, wherein the installation rod is installed on the large stand column perpendicular guide rail, and the gauge stand is used for fixing a measurement gauge. The gauge outfit of the measurement gauge is arranged on the rotation axis of the workbench. A position adjusting mechanism is arranged between the gauge stand and the installation rod. The position adjusting mechanism comprises a rod sleeve and a movable rod capable of moving inside the rod sleeve up and down. A puller bolt for fastening the movable rod is arranged on the rod sleeve. The gauge stand is fixed to the movable rod. The rod sleeve is fixed to the installation rod. According to the principles of measurement in sections and the requirement for same-level precision, on the condition that the measurement standard is low, the precision of a measured piece with the super-long stroke can be measured, so that the parallelism of the large stand column perpendicular guide rail relative to the rotation axis of the workbench is detected, and the detection precision is high.