NOVELTY - Treatment of saponin-alcohol comprehensive wastewater comprises introducing wastewater into primary pH adjusting sedimentation tank; introducing into hydrolysis acidification tank, reacting and standing; clarifying in acidification sedimentation tank, and conducting electrolytic reaction; precipitating in secondary pH adjusting sedimentation tank; sending supernatant into upflow anaerobic sludge blanket (UASB) reactor, standing and discharging the produced methane; and flowing water into biological contact oxidation reactor, standing and reutilizing or discharging the yielded water.    USE - Method for treating saponin-alcohol comprehensive wastewater, which is the final wastewater of clean production technology for diosgenin (claimed).    ADVANTAGE - The method can effectively remove the COD in comprehensive wastewater.    DETAILED DESCRIPTION - Treatment of saponin-alcohol comprehensive wastewater comprises:    (A) discharging wastewater to an adjusting tank firstly, standing for 2-3 days and then introducing into a primary pH adjusting sedimentation tank by a sewage pump arranged in the adjusting tank; adding ground quick lime to raise the pH value of the wastewater to 5.0-6.5; obtaining the comprehensive wastewater with adjusted pH value; keeping the wastewater in primary pH adjusting sedimentation tank and precipitating for 10-12 hours to achieve a chemical oxygen demand (COD) removal rate of 10-15%;    (B) raising the temperature of the wastewater to 30 degrees C by sewage pump through a heat exchanger; then introducing into hydrolysis acidification tank for hydrolysis acidification reaction; and standing for 30 hours to achieve a COD removal rate of 22-24%;    (C) overflowing the wastewater after hydrolysis acidification to an acidification sedimentation tank for clarifying; pumping the supernatant into an internal aeration electrolysis reactor for electrolytic reaction; and standing for 1.5 hours to achieve a COD removal rate of 10-30%;    (D) adding ground quick lime to adjust the pH to 7.0-8.0 after the yielded water of the internal aeration electrolysis reactor flows into a secondary pH adjusting sedimentation tank automatically; standing and precipitating in secondary pH adjusting sedimentation tank for 10-12 hours to achieve a COD removal rate of 7-12%;    (E) sending the supernatant of secondary pH adjusting sedimentation tank into a water collecting well and raising temperature to 38 degrees C; then sending into a UASB reactor; standing for 70 hours to achieve a COD removal rate of 75-85%; and discharging the methane produced during anaerobic process after going through a water-seal tank;    (F) enabling the yielded water after anaerobic treatment to flow into a fifth-grade biological contact oxidation reactor from a water outlet pipe at the upper part of UASB reactor; and standing for 55 hours to achieve a COD removal rate of 93.5%; and    (G) reutilizing or discharging the yielded water of treated supernatant in a deep treatment unit after the yielded water of aerobic treatment automatically flows into the sedimentation tank for precipitating.    DESCRIPTION OF DRAWING(S) - The drawing is a perspective view of a device used for treating saponin-alcohol comprehensive wastewater.