High-precision outside micrometer calibration device

The utility model discloses a high-precision outside micrometer calibration device, which belongs to the technical field of micrometer calibration devices and comprises a bottom plate, a back plate fixedly connected to the rear side of the bottom plate, a first electric push rod detachably connected to the front end face of the back plate, a measuring anvil fixedly connected to the front end of the first electric push rod, and a top plate hinged to the upper end of the back plate. The front end face of the back plate is fixedly connected with a supporting block, the upper end face of the top plate is detachably connected with a second electric push rod, and the lower end of the second electric push rod penetrates through the top plate and extends to the position below the top plate and is fixedly connected with scrubbing cotton. The second electric push rod is started to drive the scrubbing cotton to move downwards and clean the opposite faces of the two micrometric screw rods, so that the situation that resi