The invention relates to a multifunctional casting polyolefine firmness-increasing film which is formed by compounding a heat sealing layer, a core layer and a corona layer. The corona layer or the heat sealing layer mainly comprises the following components in portions by weight: 100 portions of polyethylene resin, 10-60 portions of compatilizer, 0.1-0.5 portion of anti-blocking agent and 0.1-0.5portion of slipping agent; and the core layer mainly comprises the following components in portions by weight: 100 portions of polypropylene resin and 0.1-1.1 portions of nucleating agent. The multifunctional casting polyolefine firmness-increasing film has the characteristics of low temperature, favorable heat sealing performance, high firmness, high elastic modulus and the like, not only combines the advantages of polyethylene and polypropylene films, but also overcomes the defects of polyethylene or polypropylene composite films, is widely applied for packing facial tissues, foods and other products, and is particularly suitable for quick and automatic package of products.