Spherical run-out measuring device

A spherical runout measuring device disclosed by the present invention comprises a contact surface seat, a bow measuring rod and a dial indicator, an annular protrusion used for abutting against a spherical surface to be measured is formed at the bottom of the contact surface seat, the contact surface seat is provided with a central through hole located at the center of the annular protrusion, and the bow measuring rod is adaptively inserted into the central through hole of the contact surface seat in a penetrating manner. A bow measuring ball head is arranged at the lower end of the bow measuring rod, a fixing part for mounting and fixing the dial indicator is arranged on the contact surface seat, the dial indicator is mounted on the contact surface seat through the fixing part, a measuring rod of the dial indicator is configured to be coaxial with the bow measuring rod inserted into the contact surface seat up and down, and the measuring rod of the dial indicator elastically abuts against the upper end face