As an efficient sample pretreatment method, microwave digestion has the advantages of fast heating speed, uniform heating, less reagent consumption, low blank space, energy saving and high efficiency compared with traditional electroplate digestion. Especially in the analysis and detection of volatile elements can well maintain the integrity of the sample, with a high sample recovery. At present, microwave digestion apparatus has been widely used in food, textile, geology, metallurgy, plastics, coal, cosmetics, petrochemical, biological medicine, environmental monitoring, sewage treatment, battery manufacturing and other fields.