There are abundant vein quartz mineral resources in the Silurian Meiziya formation phyllite in the Ankang area of the South Qinling Mountains, but the research degree as a high-purity quartz raw material is low, especially the content and occurrence state of trace impurities that affect the purification of quartz are lacking systematically to a large extent, it has restricted the quality evaluation of high-purity quartz raw materials in this area and further breakthroughs in prospecting. In this paper, on the basis of determining the geological development characteristics of vein quartz, three vein quartz samples (AK200, AK201, AK202) produced in three regions were tested for impurity elements in the samples. The purification performance of AK200, AK201 and AK202 was studied, and the purification test was carried out. The results showed that the SiO2 content of the three samples after purification was 99.99311%, 99.99766% and 99.99858%, respectively, all of which reached the quality of high-purity quartz products. requirements, in which the AK202 sample reaches 4N8 level after purification. The research shows that after purification, Al, Ti, Na and K are the main impurity elements, and Al mostly exists in the form of impurity minerals and lattice impurities; Ti mostly exists in the form of lattice impurities; Na and K mostly exist in the form of fluid inclusions. Impurity minerals, fluid inclusions, and lattice impurities all have varying degrees of influence on the quality of the vein quartz, among which fluid inclusions are the main influencing factor, lattice impurities are the second, and impurity minerals have the least impact. This conclusion has important reference significance for evaluating the quality of vein quartz mineral resources in this area and clarifying the characteristics of future prospecting targets.