The invention discloses a novel tank body structure for a fermentation tank. The novel tank body structure comprises a base, a tank body, a motor, a rotating shaft, stirring blades, a temperature sensor, a thermometer and an airflow pipe, and is characterized in that support blocks are arranged on the base, and lock latches and traveling wheels are arranged on the support blocks; the tank body is arranged on the base; an interlayer is arranged on the tank body; a stabilizer, a charging opening, a water inlet pipe, a discharge pipe and a water outlet pipe are arranged on the tank body; the motor is arranged on the stabilizer; one end of the airflow pipe is arranged in the tank body; an exhaust valve and a pressure gauge are arranged on the airflow pipe. According to the novel tank body structure, the interlayer is arranged on the tank body, and is connected with the water inlet pipe and the water outlet pipe, so that hot water of certain temperature can enter the interlayer to provide a constant temperature condition for material fermentation in the tank body and improve the fermentation efficiency and fermentation quality of a material; a branch pipe is arranged on the water outlet pipe, and the used hot water can be reused through the branch pipe, so that the cost is reduced.