Vapor-phase antirust cold-stretching protective film as well as preparation method and application thereof

The invention provides a gas-phase antirust cold-stretching protective film. The protective film sequentially comprises an inner layer, a middle layer and an outer layer from inside to outside, the outer layer is prepared from the following raw materials in parts by weight: 70 to 80 parts of metallocene linear polyethylene, 20 to 30 parts of linear polyethylene and 1 to 4 parts of processing aid master batch; the middle layer is prepared from the following raw materials in parts by weight: 5 to 30 parts of ethylene-propylene copolymer and 70 to 95 parts of metallocene linear polyethylene; the inner layer is prepared from the following raw materials in parts by weight: 60 to 80 parts of metallocene linear polyethylene, 20 to 30 parts of linear polyethylene, 2 to 10 parts of gas-phase antirust master batch and 1 to 4 parts of processing aid master batch. The protective film has excellent tensile strength, tear resistance, small permanent deformation and good flex and rebound resilience under the combined action