Ultraviolet disinfector is widely used in water treatment and has high value. It destroys and changes the DNA structure of microorganisms by ultraviolet irradiation, so that bacteria can not reproduce or die immediately, so as to achieve the purpose of sterilization. The real bactericidal effect is ZXB ultraviolet light, because the C-band ultraviolet light is easily absorbed by the organism's DNA, especially around 253.7 nm ultraviolet light is the best. Ultraviolet disinfector is a pure physical disinfection method, with the advantages of simple and convenient, broad-spectrum and high efficiency, no secondary pollution, easy management and automation. With the introduction of a variety of new design of ultraviolet lamp, ultraviolet sterilization application is expanding.