NOVELTY - The fermenting device comprises a tower type main body including a set of fermentation rooms. An exhaust pipe is connected with fermentation rooms. A mixing box includes a vent that is opened and closed with the supply of a raw material pipe. The fermentation rooms include a vent that is respectively opened and closed with an opening/closing plate that is arranged under the mixing box. A discharge chamber includes a conveyor beneath the fermentation room. A filter and a lift pump are formed in an upper part of the tower type main body.    USE - The fermenting device is useful for preparing an organic fertilizer (claimed).    ADVANTAGE - The method is capable of preparing the organic fertilizer in an effective manner, increasing the profit of the farmers by the activation of the environment-friendly agriculture.    DETAILED DESCRIPTION - The fermenting device comprises a tower type main body including a set of fermentation rooms. An exhaust pipe is connected with fermentation rooms. A mixing box includes a vent that is opened and closed with the supply of a raw material pipe. The fermentation rooms include a vent that is respectively opened and closed with an opening/closing plate that is arranged under the mixing box. A discharge chamber includes a conveyor beneath the fermentation room. A filter and a lift pump are formed in an upper part of the tower type main body. A hopper type mixing tank includes a mixing blade that is rotated within a mixing tank using a motor. A driving roller is connected with an inner ending part of a frame. The exhaust pipe of the fermentation room is connected with a bearing. The opening/closing plate opens and closes the vent of the fermentation rooms. A crushing chamber is respectively connected to top and bottom ends of a pulverizing device, and includes a cutter that is operated with the motor, where the cutter is installed under the vent of the fermentation rooms within the crushing chamber. An air supply pipe is connected to an air pump in a bottom surface of the fermentation rooms. A leachate discharge pipe is connected to the leachate water collecting tank. The leachate water collecting tank is connected to each of the fermentation rooms and includes a leachate supply tube.