Steel part pickling solution recycling system

The invention discloses a steel part pickling solution recovery treatment system, which belongs to the technical field of hazardous waste treatment, and comprises a waste acid storage pool, a micro-electrolysis circulation tank, a blending pool and an oxidation tower, the micro-electrolysis circulation tank is connected with the blending pool, and waste liquid in the waste acid storage pool is injected into the micro-electrolysis circulation tank and the blending pool respectively; the waste liquid is converted into ferrous chloride in the micro-electrolysis circulation tank, and the molar ratio of hydrochloric acid to ferrous ions is adjusted to be 1: 1 through a blending pool; oxygen and a catalyst are input into the oxidation tower, and ferrous chloride is subjected to catalytic oxidation in the oxidation tower to produce ferric chloride. Divalent iron in the steel part pickling waste liquid can be quickly and efficiently oxidized at normal temperature and normal pressure through a microelectrolysis + blen