In the process of hospital operation, it is inevitable to produce wastewater with direct or indirect infectious and toxic hazards. The source of these wastewater determines the complexity of its composition, involving a variety of biological, chemical or radioactive pollution. Medical wastewater not only contains a large number of pathogens such as bacteria, viruses and eggs, but also contains chemical substances and radioisotopes, which has several characteristics of space pollution, acute infection and latent infection. If the medical sewage containing pathogenic microorganisms is directly discharged into urban sewers without disinfection, inactivation and other harmless treatments, it will often cause water and soil pollution, seriously lead to various diseases, or lead to the outbreak of waterborne infectious diseases.