The invention discloses a polypropylene film which is not stretched after high temperature cooking. The polypropylene film has a three-layer structure, including an outer surface layer, a middle layer and a heat sealing layer. Main materials of the outer surface layer are graft copolymer polypropylene, polyolefin elastomer or metallocene polyethylene and bonding agent; main materials of the middle layer are graft copolymer polypropylene or random copolymer polypropylene or the mixture of the two, polyolefin elastomer or metallocene polyethylene; main materials of the heat sealing layer are graft copolymer polypropylene, polyolefin elastomer or metallocene polyethylene and bonding agent. The film can be cooked for 30 minutes at the temperature of 121-135 DEG C without stretching; the film has good tensile strength, excellent anti-impact performance and good heat sealing strength; and the heat resistance of the film is good, and the film cannot deform after cooking and is good in dimension stability.