An apparatus for treating and recycling tannery wastewater based on nano catalytic electrolysis technology and membrane technology comprises a coarse grid filter (1) a regulating tank (2) a hydraulic screen (3) a nano catalytic electrolyzer (4) a reaction tank (5) sedimentation tank (6) an air floatation device (7) a biochemical tank (8) a secondary sedimentation tank (9) a secondary nano catalytic electrolyzer (10) a filter (11) and a membrane system (12). A method for treating and recycling tannery wastewater based on nano catalytic electrolysis technology and membrane technology is also provided. The steps of the method comprise nano catalytic electrolysis; flocculation; biochemical treatment; secondary catalytic electrolysis; filtration; and membrane filtration. The method has the advantages of high CODCr removal rate low consumption of chemical agents low production of sludge thorough treatment and high water recycling rate.
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