Automatic purification device for harmful gas in tobacco processing

The invention discloses a tobacco processing harmful gas automatic purification device which comprises a filtering module, an adsorption module and a biological module, the filtering module comprises a power cavity, a filtering cavity and a buffering cavity, a piston disc and a telescopic part used for driving the piston disc to reciprocate are arranged in the power cavity in an intercepting mode, and the filtering cavity is coaxially communicated with the power cavity; a sealing door capable of being automatically closed is arranged between the filtering cavity and the power cavity, a plurality of sets of filtering net assemblies with filtering holes gradually reduced are arranged in the filtering cavity, and the buffering cavity is communicated with the power cavity through an air inlet with an air inlet one-way valve. The purification device can be used for filtering, adsorbing and biologically treating harmful gas generated by tobacco processing, so that the purification effect is ensured; the filter modu