The invention discloses a
system for purifying and circularly utilizing water in a fish
aquaculture pond, and the
system comprises an ecological channel, a secondary purification tank, a
tertiary purification pond and a culture pond, and the ecological channel, the secondary purification tank and the
tertiary purification pond are respectively provided with aquatic plants and aquatic animals having a purification effect. The invention also discloses a method for purifying and circularly utilizing the water in the fish
aquaculture pond, and the method is characterized in that by utilizing the
system, the water is sequentially purified in three levels and then enters the
aquaculture pond through the power, and waste water in the aquaculture pond is re-discharged into the ecological channel to form the circulation of the entire culture process water. Through the three-level purification, the internal circular purification of the aquaculture water can be realized, the dependence on external water can be greatly alleviated, no
pollutant is discharged, environmental friendliness can be realized, the
health development of the aquaculture can be realized, a majority of the aquatic plants and the aquatic animals are cash crops, and the culture benefit can be effectively increased; and moreover, simplicity in operation is realized, the cost is low, and popularization in different types of ponds can be realized.