The present invention provides an implant positioning device for an orthodontic brace, that is fitted on to the orthodontic brace of a patient. The implant position device mainly includes a measuring standard member and at least one encircled member, whereby the at least one encircled member is used in conjunction with the orthodontic brace that is directly in connection with the measuring standard member. The measuring standard member forms a detection region having measuring scale by means of a radiopaque material. A positioning unit is configured on one side of the detection region. Moreover, the at least one encircled member forms an encircling main body that can be elastically extended. The encircling main body forms a sleeved space that can accommodate the orthodontic brace, and the size of the sleeved space can be adjusted. The encircling main body together with the positioning unit forms a connecting unit for fixing means, such that the implant positioning device can be rapidly assembled on to or removed from the orthodontic brace. Moreover, an X-ray image having a measuring scale is projected to an X-ray film by means of an X-ray projecting machine in accordance with the present invention.
