Livestock breeding excrement treatment method

The invention discloses a livestock breeding excrement treatment method. The livestock breeding excrement treatment method comprises the following steps that S1, liquid and residue separation is conducted on livestock excrement to obtain urine and fecal residues; S2, large-particle waste is removed through initial settling conducted on the urine obtained after separation, and then polyaluminum chloride and polyferric sulfate are added into the urine after initial settling and are rapidly stirred, then bicarbonate is added for coagulating sedimentation, and finally anaerobic fermentation is performed; S3, the water content of the fecal residues obtained after separation is controlled to be lower than 60%, then a complex microbial agent is added for anaerobic fermentation, the fermentation humidity is controlled to 60-65 DEG C, the fermentation temperature is controlled to 60-65 DEG C, the fermentation time is controlled to 10-20 hours; S3, the complex microbial agent is prepared from the following bacteria: ba