The boiler is prone to high temperature corrosion of heating surface when burning coal with high sodium content, soot deposition in flue and slagging in water wall, which seriously affects the heat transfer effect and thermal efficiency of boiler. In this paper, the influence of time and temperature on the demineralization effect of coal with high sodium content is studied by analyzing the coal quality characteristics of coal with high sodium content and using the method of ion exchange to study the effect of time and temperature on the removal of sodium from coal with high sodium content.