Single-row four-point contact ball-type slewing bearing rolling path measuring rod

The utility model discloses a single-row four-point contact ball-type slewing bearing rolling path measuring rod, and belongs to the technical field of industrial measurement. The measuring rod comprises a fixing support (3) of which the number is not less than one, and supporting bars of which the number is not less than two. The supporting bars comprises a short supporting bar (6) and a long supporting bar (6.1), two ends of the fixing support are respectively connected with the supporting bars via a connection rack (8), and the supporting bars are installed coaxially. A fixed measuring hemisphere rack (1) is installed at a tail end of the short supporting bar, and a fixed measuring hemisphere (1.1) is disposed on the fixed hemisphere rack. A moving measuring hemisphere rack (4) is installed at a tail end of the long supporting bar, a moving measuring hemisphere (4.1) is disposed on the moving hemisphere rack, and a dial indicator (5) is connected with and installed on a back side of the moving measuring he