Bearing ring size measuring device

The utility model relates to a bearing ring dimension measuring device, which comprises a base provided with a measuring element and a ring mounting structure, at least one of the measuring element mounting structure and the ring mounting structure is a position-adjustable mounting structure, and the ring mounting structure comprises a bearing structure for bearing a bearing ring to be measured and a positioning structure. The bearing structure is used for being matched with the peripheral face of a bearing ring to be measured, so that the bearing ring to be measured can be limited in the radial direction and placed on the bearing structure with the axis facing the measuring element, the positioning structure is provided with a positioning face facing the measuring element, and the positioning face is used for being in positioning fit with the axial end face of the bearing ring to be measured. An operator can directly place the bearing ring to be measured on the bearing structure, the forming reference surfac