A cuff device comprising a ring and a wrapping strip with first and second surfaces is mentioned. A first coupling portion and a first fixing portion are disposed on the first surface, and a second fixing portion and a wrapping portion are disposed on the second surface. The ring comprises a ring body and a second coupling portion. The ring body moves between an end and an opposite end of the wrapping strip, and the wrapping strip can pass through the ring body. The second coupling portion is disposed on the ring body and on the second surface. Wherein the second coupling portion is bonded with a first position of the first fixing portion to form an accommodating space, the first coupling portion is folded reversely at a second position and is bonded with the first fixing portion, and thereby the accommodating space has a fixed surrounding surface.
