The invention discloses an industrial fermentation wastewater treater, and relates to the field of sewage treatment, the industrial fermentation wastewater treater structurally comprises a filter tank, a treatment tank, a reservoir, a water outlet, a base, a water return device, an air inlet pipe, a motor, a main shaft and a water inlet, the water inlet is arranged on the filter tank, the filter tank is connected with the treatment tank, the water return device is fixed on the filter tank, and the main shaft is arranged in the filter tank. The air inlet pipe penetrates through the water return device, and the motor is in transmission connection with the main shaft. The industrial fermentation wastewater treater has the advantages that the cleaning device can clean the water inlet, the influence of high-viscosity substances on adhesion to the inner wall of the water inlet and on the water inlet efficiency is reduced, filtered suspension is shaken into an external filter box through back-and-forth movement of the filter screen, meanwhile, water flowing into the filter box can be secondarily filtered, bubbles generated by the air floatation device can adhere to small suspended particles which cannot be filtered in the wastewater so that the small suspended particles are suspended on the water surface, and the wastewater treatment efficiency is improved.