Large-scale farm excrement resource utilization system

The invention relates to a large-scale farm manure resource utilization system, which is characterized in that after manure of a farm passes through a grating pool and a solid-liquid separator to remove a large amount of suspended solids, dry manure and other solid substances, sewage enters an anaerobic fermentation tank to be subjected to anaerobic fermentation, and the separated solid substancesare subjected to composting treatment after being dehydrated by a centrifugal dehydrator; then the sewage enters a tubular micro-filtration membrane, a two-stage RO device and a DTRO device, COD, SSand other substances in the sewage are further removed, then a concentrated solution is prepared into a liquid fertilizer, and clear water is reused as fence flushing water of a factory after disinfection treatment. According to the method, a series of defects caused by unreasonable treatment of the excrement in the farm and the pollution problem to the environment are solved, zero emission of theexcrement is achieved, and