The present disclosure discloses a bracket packaging cartridge and a method for clamping a bracket. The bracket packaging cartridge includes a cartridge body, an inner support and a cover body. A placement cavity is arranged on the cartridge body, the inner support is arranged in the placement cavity, and the inner support is provided with a plurality of bracket placement grooves. The bracket placement groove is used for placing the bracket. The cover body and the cartridge body match each other. The bracket placement groove includes a placement opening portion, a placement side portion and a placement bottom portion. The placement side portion is provided with a retaining protrusion, and the placement bottom portion of the bracket placement groove is inclined.