Metal surface coating wastewater reuse system

The invention discloses a metal surface coating wastewater reuse system comprising a physicochemical treatment unit, a hydrolysis acidification tank, an MBR tank, a first biological aerated filter tank, an activated carbon filter, a reverse osmosis system and a second biological aerated filter tank; sewage is treated by the physicochemical treatment unit to remove heavy metal ions, phosphate ionsand suspended solids in the sewage; effluent of the physicochemical treatment unit flows into the hydrolysis acidification tank for degradation treatment; effluent of the hydrolysis acidification tankflows into the MBR tank for purification treatment; effluent of the MBR tank flows into the first biological aerated filter for purification treatment; effluent of the first biological aerated filterflows into an activated carbon filter to remove residual chlorine, effluent of the activated carbon filter flows into the reverse osmosis system to be purified, produced water of the reverse osmosissystem is reused, and a conc