The invention relates to an easily-torn PE film material, and a preparation method and applications thereof. The easily-torn PE film material possesses a layer structure, and comprises a film layer composed of, by weight, 55 to 70% of polyethylene, 30 to 40% of an ethene cycloolefin copolymer, and 0 to 5% of a processing auxiliary agent. The easily-torn PE film material possesses a simple layer structure; cooperation of one or a plurality of material hoppers in a film blowing machine extrusion unit and a film blowing machine are adopted for one time film blowing to obtain a single layer film,double layer coextrusion film and three layer coextrusion film material, application range is widened, and package requirements of PE common package bags, paper package bags, sanitary napkin package bags, or paper diaper package bags are satisfied. The easily-torn PE film material can be torn by hands along any direction, no tearing deviation is caused, package bags can be opened without using anytools, and it is extremely convenient to use.