Water body quality improving system

The utility model relates to a water body quality improving system capable of circularly sterilizing and disinfecting a water body and maximally utilizing limited water resource. The system comprises a water pool, a first water pump, a filter system and a water treatment device, wherein the water pool is provided with a water inlet and a water outlet; the first water pump is communicated with the water pool; the filter system comprises a first filter, a first filter system and a second filter system; the first filter is communicated with the water pump; the first filter system and the second filter system are respectively communicated with the water inlet and the water outlet; the first filter system comprises a sterilization device; the second filter system comprises a control valve and an ion exchange resin; the water treatment device is an electrolytic tank; and the electrolytic tank is positioned on the downstream of ion exchange resin. The system is provided with two filter systems, chloride containing ions in the water body can be utilized more sufficiently, the replacement time for water in the water pool can be prolonged, water resource can be saved, and cost can be reduced.