Engineering biogas fermentation device and method

The invention discloses an engineering biogas fermentation device and a method thereof. The fermentation device comprises a liquid fermentation material feeding mechanism and a solid fermentation material feeding mechanism, the liquid-state fermentation material feeding mechanism comprises a homogenizing tank; the homogenizing tank is connected with a feeding hole of the fermentation device through a liquid inlet pipe; the solid-state fermentation material feeding mechanism comprises a feeding hopper and a conveying device, the conveying device comprises a motor and a conveying belt driven by the motor, the feeding hopper is arranged on the conveying belt, and solid-state fermentation materials are fed to the fermentation device through the conveying device as required after entering the feeding hopper; the liquid-state fermentation material feeding mechanism and the solid-state fermentation material feeding mechanism are matched to form a mixing area for feeding in two directions at the bottom of the ferment