Concentration and reduction system and method for salt-containing wastewater

The invention relates to a salt-containing wastewater concentration reduction system and method, the system comprises a reverse osmosis desalination device, an impurity purification device, a constant temperature control device and a low desalination membrane concentration device which are sequentially communicated through a pipeline, and the method comprises the following steps: carrying out desalination treatment on salt-containing wastewater to obtain concentrated water and produced water; carrying out impurity removal treatment on the concentrated water in the reaction zone; separating the concentrated water from which the impurities are removed to obtain purified produced water and concentrated solid substances; heating the purified produced water, performing constant-temperature control, discharging the purified produced water to a low-desalination membrane concentration device, performing concentration treatment to obtain concentrated water and produced water, and discharging the produced water to a re