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This utility model relates to the field of microbial fermentation engineering technology, specifically to a solid-state fermentation device for Beauveria bassiana, including a fermentation chamber. A fan and a ventilation pipe are respectively installed at the upper and lower ends of the fermentation chamber. A rotating sleeve is rotatably connected inside the fermentation chamber. A motor is fixedly connected to the bottom of the fermentation chamber, and the output end of the motor is fixedly connected to the bottom end of the rotating sleeve. A cooling and oscillation mechanism periodically lifts the culture tray through a cam to generate oscillation, which, together with the air circulation of the fan and ventilation pipe, enhances the heat exchange between the substrate and the cold air. The spiral stirring blade has a double-layer hollow structure and is connected to the drainage hole to guide the discharge of condensate or cleaning wastewater. At the same time, the hollow structure reduces the temperature of the stirring blade itself and assists in the heat dissipation of the substrate.