The invention relates to a regenerating method of organic waste water by adoption of an enzyme-mimic magnetic catalyst. According to the technical scheme, the method includes adding an inorganic acid into the organic waste water fed into a vortex mixer (1), adjusting pH to 3.5-6, feeding the acidified organic waste water after pH adjustment into a catalytic degradation reactor (2), adding the enzyme-mimic magnetic catalyst into the catalytic degradation reactor (2) containing the acidified organic waste water, adding H2O2 with the mass ratio of the enzyme-mimic magnetic catalyst to the H2O2 being 1:1-4.5, stirring at 20-30 DEG C with air blowing by an air blower (3) for 60-120 min to obtain suspension, allowing the suspension to flow automatically into a catalyst separation column (4), allowing the suspension to stand for 10-30 min under the action of a magnetic field, returning the enzyme-mimic magnetic catalyst in the lower layer to the catalytic degradation reactor (2) through a return pipe (5) to be reutilized, and using the supernatant liquid as industrial reclaimed water. The method has characteristics of simple process, high operationality, low investment, low operation cost, low running cost, and wide COD ranges of treated water.