Anaerobic tank is an experimental equipment used in biology teaching and laboratory to cultivate microorganisms in anaerobic environment and simulate the living conditions of anaerobic organisms. It is usually made of stainless steel or plastic and equipped with a gas displacement system inside, which can remove oxygen and fill with gases such as nitrogen or carbon dioxide to maintain a strict anaerobic environment. In biology teaching, anaerobic tanks allow students to observe and study the growth characteristics of anaerobic bacteria, and understand the important role of these microorganisms in nature and human life. By using anaerobic tanks, students can learn relevant knowledge of microbiology, ecology, and environmental science, and master the basic skills of anaerobic cultivation.