The invention discloses a biaxial tension polyethylene film and a preparation method thereof. The biaxial tension polyethylene film comprises at least one film layer, wherein the at least one film layer comprises the following components in percentages by weight: 90-99.5% of metallocene linear low-density polyethylene resin, 0-10% of antistatic agent, 0-5% of antiblocking agent, 0-5% of slipping agent and 0-5% of antioxidant. A packaging material has the advantages of high heat-sealing strength, puncture resistance strength, stiffness and tensile strength, excellent low temperature resistance, durable wetting tension, small use thickness, low cost, energy saving and environment friendliness.