The invention discloses a microbial fermentation deodorization device applied to kitchen waste treatment, which belongs to the technical field of kitchen waste treatment and comprises a low-speed motor, a fermentation kettle, supporting legs and a deodorization box, the motor is fixedly arranged on the supporting legs through a bracket, the deodorization box is fixedly arranged on the side edges of the supporting legs, and the fermentation kettle is fixedly arranged at the upper ends of the supporting legs, and comprises a feeding mechanism, a fermentation mechanism, a material returning mechanism, a water removal mechanism, a deodorization mechanism and a transmission mechanism, the feeding mechanism is fixedly arranged at the front end of the fermentation mechanism, the fermentation mechanism is rotatably connected to the upper ends of supporting legs through a plurality of rotating wheels, the supporting legs are fixedly arranged on the ground, and the water removal mechanism is fixedly arranged at the front ends of the supporting legs, the deodorization mechanism is fixedly arranged on the two ends of the fermentation kettle, the transmission mechanism is fixedly arranged on the edge of the upper end of the supporting leg, and the problems that an existing kitchen garbage disposal machine can emit foul irritant gas in the kitchen garbage disposal process, discharging is difficult, and feeding and cleaning cannot be continued are solved.