The present application discloses an adaptive finger size ring. The adaptive finger size ring in the present application includes: a first ring body, a second ring body, and two elastic devices. There is a clamping position between the first ring body and the second ring body, and the clamping position is used to clamp a finger. One end of the elastic device is connected to the first ring body, the other end is connected to the second ring body, and the two elastic devices are respectively located on two sides of the clamping position. The elastic device, the first ring body, and the second ring body form an annular shape. The elastic device is telescopic and has a tendency to shorten in length, so that the first ring body and the second ring body are in close contact with skin of the finger. Thus, a swelling feeling caused due to poor blood flow when the ring is worn for a long time can be avoided, and wearing comfort is improved.