Hollow ultrafiltration apparatus back purge system for banknote printing gravure wastewater

The utility model relates to a backwash device of hollow hyperfiltration devices of banknote printing gravure scrape plate discharge liquid. The utility model comprises a mixing inlet of discharging liquid and cleaning fluid, a first-stage discharge liquid processing stop valve, a booster pump, a second-stage discharge liquid processing stop valve, a permeate liquid stop valve, an ultrafiltration membrane discharge liquid inlet stop valve, a concentration discharge liquid outlet, a permeate liquid outlet, an ultrafiltration membrane component, a discharge liquid outlet, a permeate liquid outlet stop valve, a backwash booster pump, a backwash stop valve and a discharge liquid atmospheric valve, wherein the mixing inlet of discharging liquid and cleaning fluid is connected with a permeate liquid outlet pipeline which is arranged on the ultrafiltration membrane component through sequentially passing through the first-stage discharge liquid processing stop valve, the booster pump, the second-stage discharge liqui