The invention discloses a dry-type full-fermentation biogas continuous and quick feeding and discharging device which comprises a tank body. The conical tank body is integrally connected with a tank bottom in a integrated manner to form a fermentation tank, a feeding system is arranged outside the fermentation tank, a discharging system is arranged in the fermentation tank, an upper feeding pipeline is arranged at the top of the fermentation tank, the upper feeding pipeline is connected with a branch pipe, the tail end of the branch pipe is connected with the top of the fermentation tank, the upper feeding pipeline is connected with a plurality of sub feeding pipes, the sub feeding pipes are connected with the fermentation tank, the upper feeding pipeline is connected with an upper feeding tank, the upper feeding tank is provided with an upper feeding motor, an output shaft of the upper feeding motor is connected with an upper feeding spiral propeller, the other end of the upper feeding motor extends into the left end of the upper feeding pipeline, the upper feeding pipe is in penetrating connection with a bottom feeding pipeline, a bottom spiral propeller is arranged in the bottom feeding pipeline, the lower end of the bottom feeding pipeline is connected with a bottom feeding motor, the bottom feeding motor is arranged at the lower end of the bottom feeding pipeline, and a reflux pump is communicated with a biogas slurry tank. The dry-type full-fermentation biogas continuous and quick feeding and discharging device has simple structure and reasonable design, effectively solves raw material fluidity to enable raw materials to be evenly distributed in the fermentation tank, improves utilization rate of the fermentation tank and reinforces tank volume gas productivity.