The stable supply of tin resources is crucial for the development of China's information industry and strategic industries, serving as a key for strengthening the manufacturing sector and promoting digital economy innovation of the country. Currently, China's demand for tin resources continues to expand; however, domestic tin resources discovered through exploration are insufficient to satisfy the consumption demand, leading to a continuous increase in imports. Therefore, ensuring the security of the international supply chain of tin resources has become increasingly important. This study evaluates the security level of the international supply chain from three dimensions: resource supply, trade circulation, and recycling, providing scientific support for ensuring the security of tin resources in China. The findings indicate that China's tin supply chain displays a V-shaped risk profile; however, there are issues such as insufficient diversification in the supply of tin resources, slow growth in domestic tin reserves, subpar mineral processing technologies, inadequate recycled tin production, and persistently low recycling rates. This research suggests that China should enhance the stability of international supply chains, strengthen domestic resource security, and improve the system for the recovery of secondary resources. These measures are expected to accelerate diversification in external procurement, increase domestic investment in tin ore exploration and beneficiation development, and optimize the strategic reserve layout of tin resources, thereby comprehensively boosting the supply capacity and safety assurance of tin resources in China.