All-polyethylene composite film and preparation method thereof

The invention relates to the field of food packaging materials, and particularly discloses an all-polyethylene composite film and a preparation method thereof. The all-polyethylene composite film comprises a surface layer, a middle layer and a base layer, wherein the surface layer comprises high-density polyethylene and an antioxidant; the middle layer comprises low-density polyethylene, a quaternary ammonium salt antibacterial agent and silicone; the base layer comprises high molecular weight polyethylene; carrying out electron beam radiation treatment on the middle layer; the preparation method comprises the following steps: mixing the high-density polyethylene and the antioxidant, and performing melt blending to prepare the surface layer; mixing a quaternary ammonium salt antibacterial agent, silicone and low-density polyethylene, performing melt blending, and performing electron beam radiation treatment on the middle layer; carrying out melt blending on high molecular weight polyethylene to prepare a base