NOVELTY - Hydrogen production inoculation sludge is subjected to aeration pretreatment. The obtained sludge and crushed food waste are mixed, and obtained sludge is added to fermentation substrate of hydrogen methane fermentation system including hydrogen production and methanogenic reactors and domestication process is carried out. The hydrogen production and methanogenic reactors are operated in batch mode, and mixed substrates are added to the hydrogen production reactor, and solid-liquid phase product in the hydrogen production reactor is directly introduced into the methanogenic reactor.    USE - Sludge and food waste mixed fermentation co-production of hydrogen and methane (claimed).    ADVANTAGE - The method enables efficient production of hydrogen and methane by stable and simple process, and simple and effective two-phase anaerobic fermentation process.    DETAILED DESCRIPTION - Hydrogen production inoculation sludge is subjected to aeration pretreatment and methanogenic inoculation sludge anaerobic domestication culture is produced. The sludge and crushed food waste having volatile solid content of 54 %mass are mixed, and obtained inoculation hydrogen production and methanogenic sludge is added to a fermentation substrate of a hydrogen methane fermentation system including hydrogen production reactor and methanogenic reactor and domestication process is carried out for 1 month. The hydrogen production reactor and methanogenic reactor are operated in batch mode, mixed substrates are added to the hydrogen production reactor through feed pump, and solid-liquid phase product in the hydrogen production reactor is directly introduced into the methanogenic reactor. The mud and feed of methanogenic reactor is returned back to the hydrogen production reactor. The hydrogen production reactor has temperature of 55 degrees C, pH of 5-5.5 and hydraulic retention time of 0.8-3.3 days. The methanogenic reactor has temperature of 37 degrees C, pH of 7-7.5 and hydraulic retention time of 4.5-18 days. The volume ratio of hydrogen production reactor and methanogenic reactor is 1:5.5.