Abstract: In the context of the global economic and social transition to comprehensive green, China’s demand for clean energy has shown a sustained and strong growth trend. Biogas, as a renewable energy source, has attracted wide attention from all walks of life because of its extensive sources and environmental friendliness. Biogas is a mixture of organic raw materials such as agricultural waste, livestock manure, industrial organic wastewater and municipal solid waste produced under anaerobic fermentation conditions. This production process not only realizes the resource utilization of waste, but also effectively reduces greenhouse gas emissions, which is of great significance to environmental protection. However, in the production process, biogas will inevitably be mixed with carbon dioxide （CO₂）, hydrogen sulfide （H₂S） and other impurities, which significantly increase the transportation, storage and utilization costs of biogas, thus limiting its wide application in the energy field. To remove these impurities and increase the methane content in biogas by biogas purification technology is a key way to improve the calorific value and utilization efficiency of biogas, which has significant multiple benefits. From the perspective of economic benefits, high-purity biogas can be used as high-quality energy directly for power generation, heating or into natural gas pipeline network to increase economic benefits; In terms of climate benefits, the use of high-purity biogas can effectively reduce greenhouse gas emissions and help cope with climate change; The environmental benefits are reflected in reducing the corrosion of equipment and reducing the potential environmental pollution caused by equipment damage. As an efficient and environmentally friendly separation technology, membrane technology has shown great application potential in the field of biogas purification. There are many kinds of membrane materials, including polymer membrane, inorganic membrane and mixed matrix membrane which has developed rapidly in recent years. Different membrane materials have their own unique gas separation mechanisms, such as Knudsen diffusion mechanism and molecular sieve separation mechanism. These mechanisms are based on the chemical structure and physical properties of the membrane materials and the interaction between the gas molecules and the membrane materials to achieve selective transmission of different gas molecules.In practical applications, the process flow of membrane technology for biogas purification is also constantly optimized and innovated. The efficiency and purity of biogas purification can be improved by reasonably designing the arrangement of membrane components and operating conditions （such as pressure, temperature, flow rate, etc.）. At present, membrane technology has achieved certain research results and practical application cases in the field of biogas purification, but there are still some challenges, such as the high cost of membrane materials, long-term stability needs to be improved, and insufficient anti-pollution performance. Reviews the application of membrane technology in biogas purification, including the types of membrane materials, gas separation mechanism and process flow, and summarizes and prospects the current research status in this field, aiming to provide reference for further application and development of membrane method in biogas purification.