The utility model discloses a multistage deodorization device of a
biological filter, which relates to the technical field of
waste gas treatment and comprises a treatment tank, the filter box is arranged on the outer surface of the treatment tank and is used for filtering; the sealing cover is arranged on the upper surface of the treatment tank; the heating unit is arranged in the treatment tank and is used for heating; the stirring unit is arranged in the
treatment pond and used for stirring, the inner wall of the
treatment pond is fixedly connected with a partition plate, and the interior of the filter box is detachably connected with a multi-stage filter screen plate. According to the utility model, the heating box, the
circulating pump, the connecting
pipe, the circulating heating
pipe and the temperature controller are matched with one another to perform
auxiliary heating on the interior of the treatment tank, so that microorganisms in the
biological reaction tank are facilitated to decompose waste liquid; the waste liquid in the
treatment pond can be conveniently and slowly stirred by adopting the mutual cooperation of the treatment pond, the filter box, the
hydraulic cylinder, the limiting sliding rod, the moving plate, the connecting plate, the limiting block and the stirring roller, so that the
decomposition efficiency of deodorization can be improved.