Reduction treatment system and method for wastewater containing heavy metals

The invention relates to a reduction treatment system and method for heavy metal-containing wastewater, the system is characterized in that at least two reduction modules and at least one permeation module are used for carrying out reduction treatment on the heavy metal-containing wastewater, and the at least two reduction modules are set as a first reduction module and a second reduction module. The first reduction module and the permeation module are connected in series in a backflow manner in the flowing direction of incoming water, so that a stepped reduction structure is formed. The first reduction module and the second reduction module jointly form a reduction system, so that the quality of reduced produced water meets the requirement of entering an ultrapure water preparation device under the condition of ensuring normal operation of the reverse osmosis device, the investment of reduction treatment can be reduced aiming at the problem of low recovery rate of reverse osmosis membrane water, and the prod