Industrial wastewater grading comprehensive utilization method

The invention relates to the technical field of waste water of a thermal generator set, in particular to a graded comprehensive utilization method of industrial waste water, which is characterized in that waste water discharged by a low-temperature rack in a steam-water sampling module and water discharged by fine treatment sampling and testing are clean in water quality, are not polluted and are graded into zero-grade waste water; wastewater discharged by a unit drainage tank during normal operation of a unit is low-salt wastewater and is classified into first-stage wastewater; the pH value of the chemical system wastewater is slightly weakly acidic, the salt content is relatively high, the chloride ion content is relatively low, and the chemical system wastewater is classified into secondary wastewater; the refined treatment regenerated wastewater, wastewater of a unit drainage tank in the unit start-stop stage and wastewater of an ammonia area are acid-base-containing high-salinity wastewater and are class