The present invention relates to a positioning device for an orthodontic device, comprising a base and a positioning portion. The pedestal is engaged in a receiving groove of the orthodontic device as a reference point for positioning； the positioning portion is fixed to the base and has a plurality of tooth portions, the plurality of tooth portions including at least one lateral tooth portion and at least one The longitudinal tooth portion, wherein the distance between the at least one lateral tooth portion and the at least one longitudinal tooth portion is 0.5 mm. Therefore, after the optimal design, the scale of 0.5 mm is suitable as the unit change amount when the orthodontic device is moved. In actual operation, the orthodontic device is not easily displaced excessively after being finely adjusted by the positioning device, and has Simple scale calculation, it is a precise and practical positioning device.本創作係有關於一種牙齒矯正器之定位裝置，包括有一基座及一定位部。基座卡合於牙齒矯正器之一容置槽內，作為定位時之基準點；定位部固接於基座上，具有複數齒部，該複數齒部包括有至少一橫向齒部及至少一縱向齒部， 其中，上述至少一橫向齒部與至少一縱向齒部之間距係為0.5公釐。藉此，經最佳化設計後， 0.5公釐之間距刻度係適合作為牙齒矯正器移動時之單位改變量，在實際操作上，牙齒矯正器經定位裝置的細部微調後不易位移過量，且具有簡易的刻度計算性，實為一精確且實用的定位裝置。
