Multifunctional livestock and poultry manure energy regeneration pretreatment composite system

The invention discloses a multifunctional livestock and poultry manure energy regeneration pretreatment composite system which comprises an anaerobic fermentation system, a solid-liquid separation system, a biogas recycling system and an organic fertilizer utilization system. According to the invention, the excrement discharge problem of the livestock farm can be effectively solved, the excrement is fully utilized, the excrement is subjected to solid-liquid-gas three-phase separation in the anaerobic fermentation system and the waste solid-liquid separation system through the excrement pool, and the biogas enters the biogas recycling system to be conveniently recycled; solid excrement is treated and enters the organic fertilizer utilization system for fishpond breeding and farmland planting, residual liquid can also be used for providing fertilizer for farmland through irrigation, efficient utilization of energy is improved, and the whole system is convenient to operate, simple and labor-saving and has import