Unpredictable climate changes, increasing weather variability, and severe droughts demand urgent attention for solution-oriented strategies. Agricultural ecosystems worldwide are under significant stress, especially in arid regions where drought severely limits plant growth, yield, and quality. Addressing food production challenges in drought-prone areas is crucial to meet growing demands. Plants employ complex physiological, cellular, and molecular processes to combat drought stress, with silicon (Si), the second most abundant soil element, emerging as a potential mitigator. This article aims to explore the benefits, synthesis, and mechanisms of Si nanoparticles in enhancing plant drought tolerance. Silicon nanoparticles demonstrate beneficial effects on plant water status, offering promising avenues for drought mitigation. The review highlights key mechanisms responsible for Si-mediated alleviation of drought stress, including modulation of gas exchange characteristics, gene expression, nutritional homeostasis, osmotic adjustment, and antioxidant enzyme and phytohormone biosynthesis. Insights into increasing plant tolerance to drought through Si treatment are provided, offering a theoretical basis for Si application in arid and semi-arid regions worldwide. Additionally, this review article identifies information gaps and suggests future research directions to fully understand the role of silicon in reducing drought stress.