Key chain structure

The utility model discloses a key chain structure which comprises a key ring, and a connecting block is movably installed on the outer surface of the key ring. Through cooperation of the movable arc rods and the bent springs, the movable arc rods are popped out under the elastic potential energy of the bent springs, so that the movable arc rods are clamped into the key ring limiting arc grooves along the radian of the spring grooves, and the key ring seals the opening through the two movable arc rods; according to the device, the connecting block is arranged on the key ring, so that the connecting block cannot be separated from the key ring due to unforeseen circumstances such as shaking or falling off, and then the key ring and the connecting block are more stable, and through cooperation of the key ring outer groove and the pulling rod, when the connecting block needs to be dismantled, the pulling rod needs to be pulled firstly; the pulling rod drives the movable arc rod to rotate from the inside of the key