Crop straw co-fermentation device

The invention discloses a crop straw co-fermentation device. The crop straw co-fermentation device comprises a pre-treatment reaction tank and an anaerobic fermentation tank, wherein materials in the pre-treatment reaction tank enter the anaerobic fermentation tank by virtue of a discharge pipe of the pre-treatment reaction tank. The pre-treatment reaction tank can carry out aerobic, micro aerobic or anaerobic pre-treatment on crop straw, so that degradation of lignocellulose can be promoted; meanwhile, the materials in the pre-treatment reaction tank and biological metabolism heat can be transferred to the anaerobic fermentation tank by virtue of a packing auger formed by combining a spiral stirrer with the discharge pipe of the pre-treatment reaction tank, so that high-efficiency conversion of straw anaerobic fermentation is realized; besides, leachate and biogas slurry can be recycled and are used for spraying, so that environmental pollution is reduced. The crop straw co-fermentation device can greatly improve biogas production potential of biological straw, increase biogas production efficiency of anaerobic fermentation, shorten a fermentation period and reduce energy consumption of the anaerobic fermentation and is simple in structure and easy to realize.