NOVELTY - A straw pretreated hydrogen micro-aerobic fermentation biogas combined system, comprises: a pretreatment reaction tank, biogas fermenter and photosynthetic hydrogen production reactor.    USE - A straw pretreated hydrogen micro-aerobic fermentation biogas combined system (claimed).    ADVANTAGE - The system utilizes pretreatment reactor tank for crop straw pretreated straw degradation containing small molecules formed by photosynthetic hydrogen production reactor leachate into hydrogen as raw material, the straw is not easy to overcome the use of photosynthetic bacteria shortcomings while avoiding direct feeding of photosynthetic hydrogen production reactor caused the uneven illumination, while the straw pretreated transported to the methane fermentation tank to provide heat and easy-to-use materials for biogas fermentation.    DETAILED DESCRIPTION - A straw pretreated hydrogen micro-aerobic fermentation biogas combined system, comprises: a pretreatment reaction tank, biogas fermenter and photosynthetic hydrogen production reactor, the pretreatment reaction tank comprises pretreatment reactor tank jacket body, reaction jars, jars body pretreatment reaction are provided with upper and lower ends pretreatment reaction tank head and pretreatment reaction tank under the head, on the head with the pretreatment reaction tank is provided with the pretreatment reaction tank and in communication with the air inlet port, the pretreatment reaction tank and pre-reaction material sampling port outlet tank, the pretreatment reaction cask body provided with an oxygen tube through pretreatment reaction tank and pre-stirred reaction vessel transporting unit pretreatment reaction jars lower end provided with a pretreatment reactor tank discharge tubes, jars pretreatment reaction in vivo reaction tank is provided with a pre-treatment of leachate recirculation device, pretreatment reaction tank leachate recirculation device includes a pretreatment reactor tank leachate straw and grid, straw leachate pretreatment reaction tank inlet end disposed below the grid plate pretreatment reaction tank under the head, straw pretreated effluent end of the reaction tank leachate pretreatment reaction tank set on his head and sealed through methane fermentation tank head; pretreatment reactor outlet end through a straw leachate tank is provided with a pressure pump pipe connection leachate storage tank inlet is provided with a spiral separator between the pump and the leachate storage tanks, leachate storage tank outlet connection photosynthetic hydrogen production reactor feed inlet; pretreatment reaction tank through a feeding tube into the methane fermentation jars body. An INDEPENDENT CLAIM is included for a pretreatment hydrogen straw microaerophilic joint biogas fermentation method, which comprises: (A) placing the strain in a pretreatment reaction tank, using spray water to pre-treat straw at a good micro-aerobic microorganisms and oxygen from the destruction of microorganisms waxy surface layer of straw, and other aspects of polymer degradation of macromolecules straw degradation; (B) after the straw leachate collection containing degradable polymers to form small molecules, filtered through a pressure pump for feeding the dross spiral separator; auger transmission mechanism using the pretreated solid material fed into the reaction tank to produce biogas fermentation cask body; (C) filtering through a spiral separator leachate stored in the leachate storage tank, timed delivery to the photosynthetic hydrogen production reactor; (D) photosynthetic hydrogen production reactor at 30-33 degrees C in anaerobic conditions, the light control in 2000-3000 LX.