Device for detecting size of center hole of hub

The utility model provides a device for detecting the size of a central hole of a wheel hub, which belongs to the technical field of size detection and comprises a light source, a central hole detection device and a central hole detection device, and is characterized in that the light source is provided with at least one group of lamp beads; the lamp bead emits light towards the direction of the cap seam allowance; the supporting assembly is used for supporting a light source to be arranged in the hub; and a photographing mechanism. According to the device, the light source is arranged in the hub through the supporting assembly, the light source irradiates on the side wall adjacent to the inner wall of the cap spigot, the illuminated side wall reflects light to the photographing mechanism, but due to the fact that the diameter of the center hole is larger than that of the cap spigot, the brightness of one part of the side wall which needs to be reflected to the photographing mechanism is blocked by the side w