NOVELTY - Continuous straw feedstock bio-chemical circulation marsh gas fermentation device comprises a pre-processing unit, fermentation unit and circulation processing unit, where the pre-processing unit comprises a separating machine (1), a slag discharge port (2) and a transmission belt (3). The fermentation unit comprises a stack retting room (4), chemical fermentation room (5) and bio fermentation chamber. The circulation processing unit comprises a third phase separator, an air outlet, a slag discharge port, a drain pipe and a water pump.    USE - Used as continuous straw feedstock bio-chemical circulation marsh gas fermentation device.    ADVANTAGE - The device achieves the continuity between the feed and fermentation; shortens the air production period; can realize fermentation through chemical and biological method; increases the air production rate, recovers liquid; realizes circulation use of raw material, which solves the problem that the air yield of the traditional fermentation device is low, the air production period is long, the energy consumption is high; is suitable for large scale.    DETAILED DESCRIPTION - Continuous straw feedstock bio-chemical circulation marsh gas fermentation device comprises a pre-processing unit, fermentation unit and circulation processing unit, where the pre-processing unit comprises a separating machine (1), a slag discharge port (2) and a transmission belt (3). The fermentation unit comprises a stack retting room (4), chemical fermentation room (5) and bio fermentation chamber. The circulation processing unit comprises a third phase separator, an air outlet, a slag discharge port, a drain pipe and a water pump. The separating machine and fermentation unit is connected to the conveyor belt. The stack retting room, chemical fermentation room, bio fermentation room and the third phase separator is arranged from upper to lower part. The drain pipe is connected with circulation processing unit and fermentation unit.    DESCRIPTION OF DRAWING(S) - The drawing shows a schematic representation of the continuous straw feedstock bio-chemical circulation marsh gas fermentation device.    Separating machine (1)    Slag discharge port (2)    Transmission belt (3)    Stack retting room (4)    Chemical fermentation room (5)