The work aims to study the changes in elastic modulus and plastic deformation trend of biaxially oriented polypropylene (BOPP) films after repeated stretching use. With 26 μm BOPP films as the research object, uniaxial cyclic tensile tests were conducted with a maximum loading force of 1, 1.5, 2, 2.5, 3, 3.5, and 4 N for 15 loading cycles. The effects of the cycle number and loading force on the elastic modulus were summarized and compared, and the trend of film performance changes was analyzed. By comparing the elastic modulus and ratcheting strain under different cycles under the same loading stress, it was found that under the preset loading force, the elastic modulus showed an increasing trend with the increase of the cycle number, and the increasing amplitude gradually decreased. The ratcheting strain and the change trend of the elastic modulus were consistent. By comparing the elastic modulus and ratcheting strain changes under different loading forces by taking the mean, it was found that the elastic modulus first increased and then decreased with the cycle number, while the maximum and minimum strains both increased with the number of cycles. The experiment shows that the elastic modulus and the ratcheting strain of BOPP films increase with the increase of loading force and cycle number. It provides certain predictions about the changes in film properties and provides guidance for the selection of tension in actual processing.