A self-locking and positioning device for a dental brace, comprising: a brace main body, an elastic piece, and an upper cover. Wherein, on the brace main body is provided with a track and a fixing slot, while on the elastic piece is provided with a positioning piece and a slot. The positioning piece is provided with a barb, while the upper cover slides and fixes into the brace main body through the track. Then, the barb of the positioning piece on the elastic piece will act against a block portion on bottom of said upper cover, to restrict movement of the upper cover, to lock automatically the upper cover into position. The dental brace is simple in construction and easy to assemble, hereby raising production efficiency and yield.本創作提供一種牙齒矯正器之自鎖定位裝置，其係包括一矯正器本體、一彈性件及一上蓋，其中於矯正器本體上設有一軌道及一固定槽，彈性件上設有一定位件及一溝槽，且定位件具有倒鉤，而上蓋由軌道滑入矯正器本體中固定，且彈性件上之定位件的倒鉤會抵住上蓋底部之阻擋部，限制上蓋移動，自動鎖定上蓋之位置，結構簡單因此可提高生產效能及良率，更便於組裝。
