High pressure digestion tank, it can decompose of refractory material is a kind of airtight container, in the gas phase, liquid phase, plasma mass spectrometry, atomic absorption and atomic fluorescence spectrum in the chemical analysis methods such as sample preparation, used in food, medicine, the centers for disease control and prevention, more dairy products, environmental center, agricultural products, seafood, aquatic products and other industries to green tea art, rare earths, fruits and vegetables, grain and oil, eggs, meat, milk powder, etc in the lead, cadmium, chromium, methyl mercury, inorganic arsenic and other heavy metal detection.