Negative-pressure flue gas extraction device for soil treatment rotary kiln

The utility model relates to the technical field of soil treatment, in particular to a negative-pressure flue gas extraction device for a soil treatment rotary kiln, which comprises a rotary kiln barrel and a left mounting base for mounting the rotary kiln barrel. According to the negative-pressure flue gas extraction device for the soil treatment rotary kiln, an annular assembly groove internallyprovided with an arc-shaped flue gas outlet and an air guide sealing cover is formed in the outer side face of a rotary kiln barrel, and a negative-pressure air blower communicated with a top flue gas exhaust pipe is fixed to the upper end of a right mounting base; the air guide sealing cover is communicated with the top smoke exhaust pipe through the transversely-arranged top air guide pipe andthe obliquely-arranged communicating pipe, a negative pressure extraction device is formed on the outer side of the rotary kiln barrel, internal smoke is rapidly extracted and exhausted, and thereforethe smoke in the rotary ki