The invention discloses a high-temperature-steaming-resistant high-barrier base film. The high-temperature-steaming-resistant high-barrier base film sequentially comprises a corona layer, a bonding layer, a barrier layer, a bonding layer and a thermal sealing layer, wherein the corona layer, the bonding layers and the thermal sealing layer are made of polypropylene resin and/or modified polypropylene resin; the barrier layer is made of polyamide/ethylene-vinyl alcohol copolymer/polyamide three-layer composite resin. The invention further discloses an easy-to-tear film comprising the high-temperature-steaming-resistant high-barrier base film and a preparation method of the high-temperature-steaming-resistant high-barrier base film. The high-barrier base film produced according to a co-extrusion film blowing technology not only has high barrier, but also is not layered after high-temperature steaming; the easy-to-tear film has easy-to-tear performance, high-temperature steaming resistance and high barrier. A production technology for preparing the high-temperature-steaming-resistant high-barrier base film by a co-extrusion film blowing method is simple and convenient, so that the processing difficulty of the easy-to-tear film is reduced, and thus the production cost is effectively reduced.