The present invention relates to an orthodontic split-stage self-locking bracket having a variable groove, comprising a bracket body； a bracket bottom plate in contact with a tooth is provided at a bottom portion of the bracket body, and a groove used for mounting an archwire is provided on the bracket body； the archwire comprises a first archwire and a second archwire, the radial dimension of the first archwire being smaller than the radial dimension of the second archwire； a split-stage self-locking unit comprises an elastic pressure plate provided on a side wall of the groove, and a channel having a variable size is formed between the elastic pressure plate and the side wall of the groove, the channel being suitable for the archwire to enter and exit the groove； the radial dimension of the first archwire is smaller than the maximum passing dimension of the channel, and the radial dimension of the second archwire is greater than the maximum passing dimension of the channel. The present invention can promote strengths and avoid weaknesses in different stages of orthodontic treatment； the elastic pressure plate is designed on the groove of the bracket, which is facilitates a doctor pressing an archwire into the groove, and operation is very simple； when a tooth bears excessive tension, a first archwire in a first stage of orthodontic treatment will automatically break through the elastic pressure plate and disengage from the groove.La présente invention concerne un bracket à auto-verrouillage à étapes multiples orthodontique ayant une rainure variable, comprenant un corps de bracket ； une plaque inférieure de bracket en contact avec une dent est disposée au niveau d'une partie inférieure du corps de bracket, et une rainure utilisée pour monter un arc dentaire est ménagée sur le corps de bracket ； l'arc dentaire comprend un premier arc dentaire et un second arc dentaire, la dimension radiale du premier arc dentaire étant plus petite que la dimension radiale du second
