Lead-acid waste water treatment system is full automatic heavy metal-containing sewage treatment system, which is widely used in production of lead acid storage batteries. After adding the special chemicals in the tilted plate separator, heavy metal ions subsides. Through desalting and dewatering process, it reaches solid-liquid separation and the water meets the quality of tap water. According to different local environmental protection policy, different levels of filtering are combined dependently. Through evaporation crystallization, concentrated water makes ion turn to solid from liquid and it can meet the strictest requirements of environmental protection policy to realize the non-sewage emission.