Biological hydrogen production device

The invention discloses a biological hydrogen production device. The biological hydrogen production device comprises a crushing machine, a fermentation tank and an air washing device, wherein the crushing machine comprises a machine case provided with an inner cavity, a crushing device is arranged in the inner cavity, the inner cavity is divided into a crushing cavity and a blending cavity by virtue of a separating board, a plurality of communicating holes communicating the crushing cavity with the blending cavity are formed in the separating board, the crushing device is arranged in the crushing cavity, a crushing substrate inlet and a blending substrate inlet are respectively formed in the upper ends of the crushing cavity and the blending cavity, a mixed substrate outlet provided with a valve is formed in the lower end of the crushing cavity, the fermentation tank is connected with the crushing machine, the air washing device is connected with the fermentation tank, and the air washing device comprises at least one air washing tank, wherein at least one air washing tanks are sequentially connected. The biological hydrogen production device has the advantages that the blending cavity is arranged in the crushing machine, the crushing substrate and the blending substrate can be fully mixed while the crushing substrate and the blending substrate are crushed, the practice that crushing is firstly carried out and then stirring is carried out in the conventional technology is replaced, hydrogen production time is greatly shortened, the crushing substrate and the blending substrate are mixed more fully and more thoroughly, and a fermentation effect is better.