The electroplating industry is related to the national economy and the people's livelihood. There are more than 10000 electroplating plants in China. Electroplating industry is also an industry with high pollution and high water consumption. Generally, there are four types of wastewater generated in electroplating industry: chromium plating wastewater, cyanide containing wastewater and nickel plating wastewater, and a comprehensive wastewater. The electroplating industrial wastewater contains high concentrations of heavy metals such as copper, chromium, nickel, etc. The direct discharge has a great impact on the environment and is the most harmful.