Wet electrostatic precipitator is a kind of technical equipment that uses electrostatic field to purify and treat gas. A layer of water film is formed on the surface of dust collecting pole by means of water spray or overflow water to realize the electrostatic precipitator of polar plate dust removal. The main working principle of wet electrostatic precipitator includes three stages: charging, collecting and cleaning. Its characteristics are that it can efficiently remove dust, acid mist, water droplets, aerosols, odors, PM2.5 and other harmful substances in wet gas. It is especially suitable for dealing with occasions with high oil smoke content and complex pollutants in industrial flue gas. This kind of equipment is not only simple in structure, small in footprint, but also convenient in operation and maintenance, high in purification efficiency, can handle high-temperature and high-humidity airflow, and helps reduce the possibility of fire or explosion. However, when using wet electrostatic precipitators, it is also necessary to pay attention to the corrosion of equipment and pipelines, as well as the treatment of sewage and sludge. Wet electrostatic precipitators are widely used in industrial production and environmental protection, such as steel, electric power, machinery manufacturing, oil refining, chemical, metallurgy, printing and dyeing, coatings and other industries, as well as urban road tunnels, mining areas, coal mining, construction site dust and other fields.