Sewage treatment system for printing plant

The invention discloses a sewage treatment system for a printing plant. The sewage treatment system comprises a distillation retort, wherein the bottom part of the distillation retort is provided with an electric heater; a de-foaming agent storage pot is communicated with the distillation retort; one end of a condensing pipe is connected with the top end of the distillation retort, and the other end of the condensing pipe is connected with an oil-water separator; the condensing pipe is provided with cooling equipment; the oil-water separator is communicated with a sand filter and an anaerobic hydrolysis pond sequentially. The sewage treatment system is reasonable in design; through treating the sewage of the printing plant by the distilling method, a printing ink detergent is removed from the waste solution, and then the toxic impurities such as ammonia and chlorine are effectively filtered out from the sewage by the filter sands; the filter effect is good, the sewage after being treated can be recycled as industrial water, the operation cost of the sewage treatment system is low, and the purpose of saving the water resource can be realized.