The invention discloses a fermentation treatment device for organic wastes. The fermentation treatment device comprises a fermentation treatment chamber with a feed inlet, and a drying and storage chamber which is communicated with the discharge outlet of the fermentation treatment chamber. The fermentation treatment chamber comprises a plurality of horizontally and abreast arranged straight round pipes. An agitating screw which is driven by a motor is arranged in each round pipe. The adjacent end parts of the abreast round pipes are serially connected to form a zigzag connected run-through fermentation treatment pipe chamber. The initial end of the fermentation treatment pipe chamber is communicated with the feed inlet and the terminal end of the fermentation treatment pipe chamber is communicated with the discharge outlet. The organic wastes and zymophyte are fed through the feed inlet to enter from the initial end of the fermentation treatment pipe chamber. The organic wastes and the zymophyte in the fermentation treatment pipe chamber are fully fermented under the agitation of the agitating screws, then enter the drying and storage chamber through the discharge outlet and are dried. The fermentation treatment device is suitable for places such as families, restaurants and hotels and can purify and treat the organic wastes into fertilizers capable of being used by plants. The treated fertilizers are convenient to store and do not have peculiar smells.