Silica micropowder is an important inorganic non-metallic material, which is mainly obtained from quartz sand or rock through a series of processes such as crushing, grinding, grading and purification. It usually has high purity and small particle size distribution. In this paper, the ultrafine silicon micropowder product was successfully prepared by flotation, acid leaching, ultrafine grinding, ion cleaning and modification using quartz product separated from gravity separation tailings of tungsten mine in Fujian as raw material. The results show that the main chemical composition (mass fraction) of ultrafine silicon micropowder is SiO2 (99.820 0%), Fe2O3 (0.001 8%), Al2O3 (0.041 0%), the pH value of water extract is 7.08, the conductivity is 6.26 μS/cm, the concentration of Na+ is 0.24 ppm (1 ppm=10-6), the concentration of Cl- is 2.94 ppm, and the oil absorption value is 21.36 g/100 g. These indexes are better than the quality requirements of electronic grade active microsilicon powder of “Silicon dioxide powder for electronic and electrical industry”(SJ/T 10675—2002). This study provides ideas and methods for the effective utilization of high-value metal tailings in mines, and has positive significance for promoting resource recycling and environmental protection.