Electroplating wastewater biochemical treatment system

The utility model provides an electroplating wastewater biochemical treatment system. The electroplating wastewater biochemical treatment system comprises a mixing tank, a hydrolysis acidification tank, an anoxic tank, an aerobic tank and a sedimentation tank. The mixing tank is used for mixing electroplating wastewater and activated sludge. A first inlet and a first outlet are formed in the hydrolysis acidification tank; the first inlet is communicated with the mixing tank; a second inlet, a second outlet and a circulating inlet are formed in the anoxic tank, and the second inlet is communicated with the first outlet. A third inlet, a third outlet and a circulating outlet are formed in the aerobic tank, the third inlet is communicated with the second outlet, and the circulating outlet is communicated with the circulating inlet. The sedimentation tank comprises a fourth inlet, a fourth outlet, a sludge circulation port and a sludge discharge port, the third outlet is communicated with the fourth inlet and use