Sulfur in coal usually exists in the form of organic and inorganic sulfur. The sum of various forms of sulfur in coal is called total sulfur. The sulfur in coal is a harmful impurity for coking, gasification, combustion, etc. It causes steel to become brittle, equipment to corrode, and combustion generates sulfur dioxide, causing atmospheric pollution. Therefore, sulfur content is one of the important indicators for evaluating coal quality. The coal sample is subjected to high-temperature combustion in an oxygen flow, causing various forms of sulfur in the coal to oxidize and decompose into sulfur oxides. After being absorbed by the absorption liquid, it is analyzed and detected using an ion chromatograph, which is convenient and fast.