TECHNOLOGY FOCUS - BIOTECHNOLOGY - Preferred Device: In the dry anaerobic fermentation device for organic waste, the temperature control-insulating device is a solar heat pump system and comprises a solar radiation plate, an insulating layer, a heat pump machine set, a temperature control circulation pump, a heat storage device, a radiating device, and a temperature control device; the temperature of the heating medium in the heat storage device of the temperature control insulating device is 50-80 degrees C; the stirring device comprises a stirring shaft passing through the tank body, a stirring arm, and an impeller blade at the tail end of the stirring arm; the stirring shaft is a sealed hollow shaft, where the hollow part is filled by gas or air; the stirring arm is uniformly distributed at the radial periphery of the stirring shaft; the relative angle in the radial direction between two adjacent stirring arm is 30-90 degrees ; the stirring arm is distributed at the transverse direction of the shaft; the density of the feeding opening and the discharging opening of the stirring arm is more than the middle part; an impeller piece is mounted at an end of the stirring arm far away from the shaft; the heat exchange device comprises multiple sets of heat exchangers; each heat exchanger is set with multiple heat exchange water shades or multiple heat exchange pipes by connecting in series; an end of the heat exchanger is connected with the heat exchange pipe of the insulating device through a temperature control and insulating device; other end of the heat exchanger is connected with the reflow pipe of the insulating device; multiple sets of heat exchangers are at the external side wall of the horizontal fermentation device; each set of heat exchanger comprises at least two heat exchange shades or at least two heat exchange pipes by connecting in series; the temperature measuring device is at least two automatic temperature monitoring probes; two more automatic temperature monitoring probes are uniformly distributed along the tank body; the probe is inserted into the 0.3-1.0 m part of the horizontal fermentation device; the horizontal fermentation device is a steel structure; the heat exchange device is welded on the outer wall of the fermentation tank that is a reinforced concrete structure; and the heat exchange device is mounted at the bottom and the side wall in the fermentation tank, and covered by the plain concrete and solar radiating plate.