Wet desulphurization filtrate water recycling system and method

The invention provides a wet desulphurization filtrate water recycling system and method, and relates to the field of wastewater treatment and recovery. The wet desulphurization filtrate water recycling system comprises a wet desulphurization mechanism, a slurry treatment mechanism, a first container, a second container, a combustion mechanism and at least one spray gun. The slurry treatment mechanism is used for treating gypsum slurry generated by the wet desulphurization mechanism to obtain filtrate water, then the obtained filtrate water is used for being mixed with a denitration agent solution to obtain a diluted denitration solution, and the diluted denitration solution can return to the combustion mechanism again through the spray gun to be used for denitration treatment. According to the wet desulphurization filtrate water recycling system, gypsum slurry generated by the wet desulphurization mechanism can be fully utilized and used for a denitration process after being treated, water resources are save