The invention relates to a system for thermal hydrolysis and reuse of an anaerobic digestion biogas slurry of livestock and poultry wastes. The system comprises a homogenization tank, an anaerobic digester, a blending tank, a thermal hydrolysis reaction tank, a buffer tank, a solid-liquid separator, a three-way valve and valves; the homogenization tank, the anaerobic digester, the blending tank, the thermal hydrolysis reaction tank and the buffer tank are connected in sequence; the anaerobic digester is connected with the solid-liquid separator A and the blending tank through the three-way valve; the blending tank, the thermal hydrolysis reaction tank and the buffer tank constitute a thermal hydrolysis unit; the upper ends of the tank bodies of the blending tank, the thermal hydrolysis reaction tank and the buffer tank are provided with pipelines provided with the valves, and are communicated with each other; and the rear end of the buffer tank is connected with a solid-liquid separator B, and the solid-liquid separator B is connected with the homogenization tank. The system realizes partial reuse of the biogas slurry, and reduces the disposal cost of the back end biogas slurry, and the biogas slurry obtained after the thermal hydrolysis treatment is rich in easily biodegradable organic matters, and is reused for anaerobic digestion to increase the gas yield of raw materials inthe anaerobic digester.