High-stiffness polyolefin composite packaging bag

The utility model provides a high-stiffness polyolefin composite packaging bag, which aims to solve the problem of insufficient stiffness of a packaging bag made of a single polyolefin material in the prior art, belongs to the technical field of packaging bag production, is made of a high-barrier polyolefin composite film, and is characterized in that stiffness increasing strips for increasing stiffness are arranged at sealing openings on two sides of the packaging bag. The high-barrier polyolefin composite film comprises a stretching layer, an ink layer, a first adhesive layer, a middle barrier layer, a second adhesive layer and a heat sealing layer which are arranged in sequence. The stiffness of the packaging bag is increased by arranging the stiffness increasing strips at the sealing openings on the two sides of the packaging bag, and the stiffness increasing master batches are additionally arranged on the middle layer of the stretching layer to improve the stiffness of the film, so that the stiffness of