Selenium is one of the essential trace elements for the human body and plays a significant role in human health, Therefore, moderate intake and supplementation of selenium have become a lifestyle for pursuing health, and various selenium-enriched agricultural products are the main way for the human body to take in selenium. Selenium-rich soil and strata are the foundation for the development of the selenium-rich industry. In China, the distribution area of natural selenium-rich land resources is relatively small, and in some areas, the selenium output flux is greater than the input flux, making the sustainability weak. The Xi'an Center of Mineral Resources Survey of China Geological Survey first discovered that the Kuanping Rock Group has a high background of selenium. This discovery has expanded the development prospects of natural selenium-rich land resources in the Qinling area and has guiding significance for the development of selenium-rich characteristic land in the Qinling and surrounding areas.