The invention relates to a method for processing teeth braces. Three dimensional coordinate data of a tooth model are scanned by a scanning device in a scanning and processing worktable and are transmitted to a control computer for reading corresponded data of a tooth shape template; initial external crowns of the teeth braces are formed according to the scanning data and a forming principle of the initial external crowns of the teeth braces; the coordinate data of the initial crowns of the teeth braces and the data of the initial external crowns of the tooth shape template are scanned for a differential value operation to obtain the data of amended external crowns of the teeth braces; a three-dimensional modeling is carried out according to the scanning data of the tooth model and data of the amended external crown of the teeth braces; then the models of the teeth braces are obtained; an automatic trimming of materials other than the external crowns is carried out; direction and brightness of a light projection are set; the tooth model on the processing worktable is scanned for the differential value operation with the data of the models of the teeth braces so as to obtain point-by-point processing data of the teeth braces and send a processing order to a processing machine to process the teeth braces. The method has the advantages that: the teeth braces with external crowns almost close to a natural tooth shape can be obtained and the amendment of the external crowns of the teeth braces is convenient; internal crowns of the teeth braes closely are matched with the shape of teeth; dental treatment level is enhanced.