NOVELTY - Production of organic fertilizer using tobacco-field wastes, involves collecting the tobacco-field wastes dispersing to the field and carrying to processing workshop; thoroughly crushing the collected tobacco-field wastes; shipping the crushed tobacco-field wastes to a fermentation tank, and fermenting at 100-120 degrees C of environment in the fermentation tank; stacking the blended tobacco-field wastes in a fermentation cell to perform natural fermentation, to obtain the organic fertilizer which is capable of applying to tobacco field directly.    USE - For the production of organic fertilizer (claimed).    ADVANTAGE - The method provides the comprehensive utilization of non-applicable tobacco on field, which obtains the purpose of change wastes to treasure. The fermentation tank adopted by the method has simple structure, convenient utilization, and good fermentation effect. The obtained organic fertilizer helps to improve soil, and perfect soil texture structure. The crushed tobacco-field wastes are performed high temperature fermentation in the fermentation tank, which can effectively kill the germ in tobacco-field wastes, especially the mosaic germ carried by waste tobacco, the pesticide residual and other harmful substance, thus can prevent it from destroying soil.    DETAILED DESCRIPTION - An INDEPENDENT CLAIM is included for a fermentation tank used in producing organic fertilizer using tobacco-field wastes, comprising a rack (1), a tank (5), a loading device and a stirring device, where the tank is arranged in the rack, the top of the tank is equipped with a feed inlet (14) which is connected with the loading device, the lower end of the tank is provided with a discharge port which is equipped with a blocking material door (20), and the top of the tank is further provided with the stirring device, and the upper part of it is a cone shape, the middle part of the tank is a cylinder shape, and the lower part of it is an inverted cone shape; and the tank comprises a anticorrosive coating, heating layer, heating tube fixed bed, insulating layer, and a exterior layer which are successively arranged from inside to outside; the stirring device comprises a stirring motor (2), a stirring shaft (6), and an agitating vane (7), where the stirring motor is fixed on the top of the tank, one end of the stirring shaft is connected with the output shaft of the stirring motor, and the stirring shaft is fixed with the agitating vane.    DESCRIPTION OF DRAWING(S) - The figure shows a schematic view of a fermentation tank.    Rack (1)    Stirring motor (2)    Tank (5)    Stirring shaft (6)    Agitating vane (7)    Feed inlet (14)    Blocking material door (20)