Salinity stress is a significant challenge in global agriculture, negatively impacting the growth and productivity of agricultural crops. One proposed solution to mitigate this issue is the utilization of silica dioxide nanoparticles as an auxiliary substance in the growth and development of plants. In this regard, the current research aimed to examine the influence of silica dioxide nanoparticles on seed germination modulation in the Seed Technology Laboratory of the Faculty of Agricultural Sciences at Shahid University in the year 2017. The experiment was conducted in a factorial design within a completely randomized block format with three replications. The experimental factors included the product of two levels of nano-silicon concentrations (20 ppm nano-silicon - 48 hours accelerated aging and 40 ppm nano-silicon - 72 hours accelerated aging) and natural salinity levels (control, 4, 8, 12, and 15 dS/m). The results revealed significant interactive effects of the top treatments in the first test × salinity stress on membrane permeability traits, sodium and potassium percentages and their ratios, relative water content, and photosynthetic pigments. The treatment of 20 ppm and 48 hours of aging under salinity stress showed superiority over the 40 ppm and 72 hours of aging in membrane permeability, sodium percentage, potassium-to-sodium ratio, chlorophyll a, total chlorophyll, and carotenoid content.