NOVELTY - A molasses alcohol wastewater treatment device comprises differential pressure distillation system, three towers, and multieffect evaporation and concentration system. The differential pressure distillation system comprises crude distillation tower (1), methanol tower (2), condenser (9), preheater (8), pump (10), reboiler (4), and rectification column (3). The multieffect evaporation and concentration system comprises tank (5), multieffect evaporators (6), steam condensate tank (7), condenser and, pump.    USE - Molasses alcohol wastewater treatment device.    ADVANTAGE - The method makes full use of secondary energy, reduces energy consumption by more than 30%, and has efficient enrichment process.    DETAILED DESCRIPTION - An INDEPENDENT CLAIM is included for molasses alcohol wastewater treatment by preheating wastewater in preheater, adding to crude distillation tower, and pumping gas phase into methanol tower, while condensing liquid phase through condenser, pumping to methanol tower, and introducing pressure difference into rectification column; introducing wastewater from crude distillation tower to reboiler to carry out heating using steam from rectification tower as heat source, pumping condensate into rectification column, and extracting by-product alcohol and fusel oil; pumping wastewater from crude distillation tower to tank of multieffect evaporation and concentration system, and adding a part of liquid to reboiler to carry out heating while adding other part to next-effect evaporation tank steam drum as next-effect evaporation tank heat source; evaporating, concentrating, transporting to recycling waste tanks to be used as fuel for combustion, collecting steam through steam condensate tank, cooling forming back to liquid state to be used for fermentation, and condensing steam generated in condenser.    DESCRIPTION OF DRAWING(S) - The drawing shows a schematic diagram of molasses alcohol wastewater treatment device.    Crude distillation tower (1)    Methanol tower (2)    Rectification column (3)    Reboiler (4)    Tank (5)    Multieffect evaporators (6)    Steam condensate tank (7)    Preheater (8)    Condenser (9)    Pump (10)