The utility model discloses a packagine machine's bag framing mechanism, including the support, be equipped with a supporting bench and a conveyer belt respectively in the lower part of support, on the support, supporting bench's top is equipped with and places the mounting bracket subassembly of treating the wrapping bag, one side relative with the mounting bracket subassembly is equipped with the horizontal transfer mechanism on can transferring the conveyer belt with the wrapping bag including the material on the support, thereby is being equipped with the sucking disc subassembly that can strut the wrapping bag respectively and cliies the bag clamping device that the unloading is carried out in the wrapping bag after strutting on horizontal transfer mechanism. The utility model provides a simple structure, advantages such as excellent in use effect.