The invention discloses a process for preparing high-purity quartz from vein quartz, which comprises the steps of raw vein quartz ore selection, laser fracturing, electromagnetic roasting, water quenching, pulverization and grading, high-gradient magnetic separation, electrostatic separation, impurity removal based on a microwave complexing method, deionized water cleaning and drying. According to the invention, the process flow and structure are reasonable, the technology is advanced, efficient and easy to control, the impurity removal is targeted, high in quality index and favorable in stability; and the high-purity ultrafine quartz material can be used in such high and new technical fields as novel electric light sources, high-insulation sealing, aerospace instruments, war industry technical products, micro electronics, high-grade optical glass, quartz crucible main materials, quartz tubes and quartz rods.