The invention belongs to the technical field of packaging materials, and in particular relates to a high-resistance steam resistant packaging film convenient for direct
microwave heating and a preparation method thereof. The packaging film comprises an aluminum
oxide plated PET (
polyethylene terephthalate) film layer, a first steam resistant
adhesive layer, a
polyamide film layer, a second steam resistant
adhesive layer and a steam resistant
curtain coating polypropylene film layer which are adhered together in sequence. The preparation method of the packaging film comprises the following steps of: preparing an aluminum
oxide plated PET film by steam-plating aluminum
oxide on a PET film; then compounding the aluminum oxide plated PET film and the
polyamide film layer together to obtain an outer layer film; and compounding the steam resistant
curtain coating polypropylene film layer and the outer film layer together through a
solvent-less compounding technology, thus obtaining the packaging film. The packaging film can heated with
microwave directly, can
resist 135DEG C high-temperature
digestion to ensure that sterilization is carried out more comprehensive and thorough, and is high in resistance, good in heat sealability and
air tightness, good in
impact resistance, and excellent in physical
mechanical property.