NOVELTY - Preparing microbial organic fertilizer with fermentation tank involves preparing microbial organic fertilizer fermentation tank (1); dosing sludge (60-70 mass.%) and organic fertilizer (30-40 mass.%), and then added with probiotics; feeding the dosed material to the tank, and fermenting in seal negative pressure environment; using automatic control system to control the heating mechanism, humidifying mechanism, turning and aeration mechanism and strains adding mechanism in the reaction tank to heat; extracting the stench gas in tank, and feeding to the environment protection equipment.    USE - For preparing microbial organic fertilizer with fermentation tank (claimed).    ADVANTAGE - The method uses short times with quick yield and high productive efficiency; and is environment-friendly without stench discharging.    DETAILED DESCRIPTION - Preparing microbial organic fertilizer with fermentation tank involves preparing microbial organic fertilizer fermentation tank (1); dosing sludge (60-70 mass.%) and organic fertilizer (30-40 mass.%), and then added with probiotics; feeding the dosed material to the fermentation tank, and fermenting in the seal negative pressure environment; using automatic control system to control the heating mechanism, humidifying mechanism, turning and aeration mechanism and strains adding mechanism in the reaction tank to heat, humidify, dose strains and turn and blast the materials; and extracting the stench gas in the reaction tank with the air pump, and feeding to the environment protection equipment for treatment, and the material is fermented and rotten for 15-17 hours in the reaction tank, thus transforming to the microbial organic fertilizer. The fermentation tank body is an arch form long barrel sealing cavity chamber composed of the conveyer belt (2) and the sealing tent arranged on the conveyer to movably connect with the conveyer.    DESCRIPTION OF DRAWING(S) - The figure shows a view of the fermentation tank.    Fermentation tank (1)    Conveyer belt (2)    Feeding area (A)    fermentation area (B)    Turning station (C)