Abstract: A self-locking orthodontic bracket includes a bracket body having a first surface and an arch-wire slot disposed on the first surface, a sliding cover matched with the bracket body and comprising a second surface towards the first surface, and a deformable locking element configured for locking the sliding cover on the bracket body. A positioning groove is disposed on the second surface. The first surface includes a guiding surface, and the second surface is slidably engaged with the guiding surface. A sinking groove is disposed on the guiding surface, and a bottom surface of the sinking groove is further provided with a locking groove. A lower part of the locking element is fixed in the locking groove, and an upper part of the locking element extends into the positioning groove, such that the sliding cover is slidably locked on the bracket body.