In this paper, the wastewater from automobile painting contains resin, surfactant and heavy metal ions, Oil、 Pigments and other pollutants, especially the electrophoresis wastewater and paint spraying wastewater, which are complex in composition, high in concentration and poor in biodegradability, are treated by mass separation treatment, coagulation sedimentation, coagulation flotation, sand filtration and other processes, and good results are achieved: CODCr removal