This paper mainly analyzed the necessity of sludge water proposal in water purification plant and the physicochemical properties of sludge water. In addition, it summed up the main ways and development trends of sludge water utilization in water purification plants at home and abroad in recent years from the perspective of resource utilization. In small waterworks, it is an economical and reasonable resource-based disposal plan to re- alize the reuse of sludge water. Based on the main ways and characteristics of the reuse of sludge water, it dis- cussed the mechanism of strengthening coagulation in electric neutralization and the stability of colloid particles in water after reusing sludge water. Finally, it analyzed the effects of the sludge water reuse on the water quality safety of the original water purification process as well as the risk control.