NOVELTY - Basin liquid treatment of potato-series non-grain starch-based fuel ethanol comprises (A) pre-treatment of waste basin liquid, (B) primary anaerobic treatment, (C) intermediate treatment, (D) secondary anaerobic treatment, (E) aerobic treatment of two oxidization channels, (F) flocculation and precipitation, and (G) treating the left sludge. The step (D) includes introducing water from floating apparatus into upflow anaerobic blanket (UAB) reactor and degrading organic pollutant. The step (G) includes treating left sludge by sludge dehydrator and drying sludge into organic fertilizer.    USE - Method for basin liquid treatment of potato-series non-grain starch-based fuel ethanol (claimed).    ADVANTAGE - The method has low cost, stable technique, and high efficiency of extraction methane from wastewater, with sludge as organic fertilizer, and output water consistent with primary standard from Comprehensive Sewage Discharge Standard (GB8978-1996) of alcohol industry.    DETAILED DESCRIPTION - Basin liquid treatment of potato-series non-grain starch-based fuel ethanol comprises (A) pre-treatment of waste basin liquid, (B) primary anaerobic treatment, (C) intermediate treatment, (D) secondary anaerobic treatment, (E) aerobic treatment of two oxidization channels, (F) flocculation and precipitation, and (G) treating the left sludge. The step (A) includes removing heavy impurities from waste basin liquid via sand sedimentation basin, filtering waste basin liquid by screen plate whose bore diameter is 0.5-1.5 mm, and treating waste basin liquid by regulation of water quality, water quantity and water temperature in regulation basin; and controlling water quality uniformity chemical oxygen demand dichromate (CODCr) of 40000-80000 mg/L, buffering time of 2-3 hours and water temperature of 55-60 degrees C. The step (B) includes introducing water from regulation basin into high-temperature anaerobic tank for fermentation, whose COD concentration is 40000-80000 mg/L; and controlling temperature at 55-60 degrees C and removal rate higher than 85%, and recycling methane. The step (C) includes treating water from primary anaerobic treatment by degassing and cooling apparatus, sedimentation basin and air floating apparatus, with the purpose of separating solid from solution in digestive solution in order to improve biological environment in consistence with secondary medium-temperature anaerobic treatment (removal rate of 70-80%); and refluxing concentrated active sludge into primary anaerobic reaction tank, where retention time of water is 3-6 hours in sedimentation basin, with surface load of 0.7-1.2 m2/m3-hour. The step (D) includes introducing water from air floating apparatus into upflow anaerobic blanket (UAB) reactor, whose temperature is 33-37 degrees C; and degrading organic pollutant of sewage with different microbial floras, and recycling methane. The step (E) includes introducing anaerobic water (CODCr is not greater than 2000 mg/L) into two serially-connected oxidization channels in energy elimination tank; controlling sludge concentration of primary oxidization channel within 2000-10000 mg/L, oxygen content of 2.5-6 mg/L and retention time of 25-40 hours; and controlling sludge concentration of secondary oxidization channel within 3000-15000 mg/L, oxygen content of 3-8 mg/L and retention time of 30-45 hours. The ammonia nitrogen content of water from two stages of aerobic treatment is reduced to lower than 15 mg/L. The step (F) includes treating water from aerobic treatment by flocculation precipitation in flocculation precipitation basin, where concentration of aluminum flocculating agent is 15-25 mg/L, flocculation time is 10-20 minutes, precipitation time is 2-4 hours, and surface load is 1-2.5 m2/m3-hour, with purpose of decoloring, removing phosphorus and outputting qualified water. The step (G) includes treating left sludge by sludge dehydrator in manner of concentration and centrifugation, and further drying sludge into organic fertilizer.