Abstract: The preparation technology of sodium metavanadate was studied with ammonium metavanadate as raw material. Solventing-out crystallization was applied in sodium metavanadate solution by using ethanol as eluent and good results were obtained.The main influence factors of process were investigated，and the optimum process conditions were determined：alkali dissolving pH was 9~10，ammonium removal temperature was 90 ℃，terminal pH of concentrate was 7.5~8.0，mass concentration of total vanadium for concentrated terminal point was 160 g/L，volume ratio of solventing-out agent to solution was 1∶1，and crystallization period was 60 min.The results showed that the purity of prepared sodium metavanadate can reach more than 99.5% under the optimum process conditions，through some processes，such as alkali dissolving and impurity removal，ammonium removal and concentration，and solventing-out crystallization.The results showed that the process was simple and had an important guiding role on the preparing high-purity sodium metavanadate.

Key words: sodium metavanadate, solventing-out crystallization, alkali dissolving, ammonium removal