Abstract: A new technology for preparation of potassium fluoborate，with potassium sulfate and fluosilicic acid by-product of wet-process phosphoric acid production as raw materials was researched.Potassium sulfate excess ratio，reaction temperature， and reaction time on the yield and quality of the product were studied emphatically.Through orthogonal test，the optimal technique conditions of preparing potassium fluoborate were obtained as follows：reaction time was 70 min，potassium sulfate excess ratio was 1.20，and reaction temperature was 70 ℃.Under these conditions，the mass ratio of potassium fluoborade was more than 98%，in line with the national standard GB/T 22667—2008，and the yield of the product reached 97.58%.

Key words: wet-process phosphoric acid, fluosilicic acid, fluoboric acid