Steel acid pickling wastewater treatment system

The invention provides a steel acid pickling wastewater treatment system which comprises a raw water pump, a filter press, a cross flow organic tubular ultrafiltration membrane device, a mixed liquidcontainer, a booster pump, a reverse osmosis membrane device, a nanofiltration membrane device and a liquid conveying pipeline, wherein the raw water pump is used for feeding steel acid pickling wastewater needing to be treated; the filter press is used for primarily filtering raw water; the cross flow organic tubular ultrafiltration membrane device is used for ultrafiltration; the mixed liquid container is used for mixing the ultrafiltered raw water with reclaimed water generated by the nanofiltration membrane device; the booster pump is used for pumping the liquid in the mixed liquid container into the reverse osmosis membrane device; the reverse osmosis membrane device is used for performing reverse osmosis treatment and generating recyclable clear water; the nanofiltration membrane device is used for retreatin