Abstract: A high efficiency biometric device for producing hydrogen and methane mainly uses a two-stage anaerobic fermentation device to transform an organic wastewater mixed solution into hydrogen, methane, carbon dioxide and a removal liquid, and then uses a solid liquid separation tank to filter and separate the removal liquid to reduce the sludge and obtain the treated water with a good property. The characteristic lies in that the two-stage anaerobic fermentation device comprises a first anaerobic fermentation tank, a neutralization tank, a feeding tank and a second anaerobic fermentation tank composed of anaerobic fermentation tanks disposed in parallel. The biometric device can increase the removal rate and the methane recovery, and also has a generator for combusting the recycled gas to advantageously have the low energy consumption. Thus, the organic waste contamination is decreased, and the green energy production pathway is also increased.