The work aims to carry out quantitative study on the effects of different mass fractions of potassium hexatitanate whisker on the impact section complexity of PP/PP-g-MAH/SPTW compound packaging materials. Silane coupling agent KH550 was used to modify potassium hexatitanate whisker. The melt-blending process was adopted to melt and blend the modified potassium hexatitanate whisker with polypropylene (PP) maleic anhydride grafted polypropylene (PP-g-MAH), so as to prepare the compound materials. The tested compound materials had no notch impact strength. Scanning electron microscopy was used to analyze the morphology of compound materials with different amounts of potassium hexatitanate whiskers. Based on fractal theory, the box counting method was applied to calculate the fractal dimension of impact section morphology of compound materials and investigate the relationship between the fractal dimension of compound material’s section morphology and the impact strength. Fractal dimension values of the section were between 1.4165 and 1.8832. When all the correlation coefficients were greater than 0.92, it indicated a strong correlation, describing that the section’s fractal characteristics were remarkable. The exponential function relationship was generally discovered between the impact strength of compound packaging materials and section’s fractal dimension. The surface fractal dimensions of impact section of polypropylene compound packing material can effectively reflect the macro-mechanical properties of composite packing materials.