The invention discloses a novel polyethylene film material and a preparation method thereof. The novel polyethylene film material is prepared from the following raw materials by weight percent: 86-96.5% of polyethylene, 2-8% of modified layered silicate mineral, 1-5% of low density polyethylene grafted maleic anhydride (LDPE-g-MAH), and 0.5-1.0% of ultrafine titanium dioxide. The novel polyethylene film material has the advantages that the original mechanical property of the polyethylene material is maintained by the polyethylene film prepared by the preparation method, meanwhile, the polyethylene film has good barrier property, and an antioxidant is fixed on the surface of layered nanometer silicate, so that the mobility of the antioxidant can be reduced, and the pollution possibility on the food is reduced; the traditional organic ultraviolet stabilizer is replaced by using ultrafine titanium dioxide, the appearance problem caused by migration and precipitation of the ultraviolet stabilizer can be effectively reduced, and meanwhile, titanium dioxide also has a certain antibacterial effect, so that the traditional antibacterial agent can be partially or completely replaced; 3, the preparation method of the polyethylene film provided by the invention is simple in production technology, low in cost and easy to industrialize.