A sodium sulfite leaching method was adopted to purify selenium. Effects of concentration of sodium sulfite solution, leaching temperature, leaching time, stirring speed in selenium leaching process and concentration of sodium sulfide solution in the purification process on selenium purification were studied. The sample was analyzed by XRD and SEM. The results show that under the conditions of sodium sulfite solution of 300g/L, leaching temperature of 98 oC, leaching time of 2 h, stirring speed of 150 r/min and sodium sulfide solution of 2 g/L, the integrated effect of selenium purification is best. The leaching rate of selenium is 98.6% and the purity of fine selenium is 99.98%. XRD analysis shows that the purity of the sample is further improved. SEM analysis shows that the as-prepared selenium powders are shuttle-like and in homogeneous distribution.