Heat-resistant polyethylene film with high water vapor barrier property and preparation method thereof

The invention discloses a heat-resistant polyethylene film with high water vapor barrier property and a preparation method thereof, and relates to the technical field of polyethylene films, the heat-resistant polyethylene film comprises a layer A material and a layer B material, and the layer A material and the layer B material are alternately combined through a laminator to extrude the polyethylene film with a 25-1025-layer structure; the upper surface layer and the lower surface layer of the polyethylene film are made of the A-layer material; the layer A is made of modified high-density polyethylene; the layer B is made of modified low-density polyethylene; the modified high-density polyethylene is prepared from the following materials: high-density polyethylene, dicycloheptane dicarboxylic acid disodium salt and calcium stearate; the modified low-density polyethylene is prepared from the following materials: low-density polyethylene, an ethylene-norbornene copolymer and 1, 2, 2-trichloro-N-[2-[[4-(trifluor