An implant positioning device is fitted on to an orthodontic brace of a patient and used in between an X-ray projecting machine and an X-ray film. The implant positioning device includes a measuring standard member, that forms a detection region by means of a radiopaque material and has a positioning unit on one side of the detection region. The detection region is provided with at least one set of measuring scales. An encircled member is integrated with one side of the measuring standard member and forms an encircling main body that is connected to the orthodontic brace. A sleeved space is collectively formed by the encircling main body and the measuring standard member.
