Abstract: Water purification technology and equipment play an important role in the development of freshwater aquaculture.This paper lists the types and uses of water purification equipment currently used in freshwater aquaculture,and understands its development status.This paper summarizes and suggests the existing problems of equipment in China at present,and introduces new technologies and processes for aquaculture tail water treatment at home and abroad,which provides a multi-angle reference for designing aquaculture wastewater treatment system more scientifically in the future.