TECHNOLOGY FOCUS - BIOLOGY - Preferred Method: In the step (i), the solid separated by manure sewage solid and liquid separation initially enters a dosing tank, where the solid content is 8-30%, and then the separated sewage enters a sedimentation tank, in which the fine particles in sewage are deposited to form sludge. In step (ii), the sludge in the sedimentation tank regulates the solid in the dosing tank into solid leavening having the solid content of 6-12%. In step (iii), the produced bio-gas residue enters a bio-gas sedimentation tank, the deposited bio-gas is treated with solid and liquid separation, and then the nutrient elements are added to the separated bio-gas residue to produce organic fertilizer. The produced bio-gas liquid enters a bio-gas liquid sedimentation tank for depositing to form bio-gas liquid and sludge, and the bio-gas liquid enters a medium pool, while the sludge enters the dosing pool. In step (iv), the sewage produced in step (i) is initially led to the sedimentation tank for depositing, then the deposited sewage enters the medium water tank to mix with the bio-gas liquid in the medium water tank to perform sewage anaerobic fermentation. The aqueous water produced in the fermentation process enters the storage tank, and the aqueous water in the storage pool is used as foliar fertilizer or for replenishing irrigation water. In the step (i), the solid and liquid separation is achieved by a solid and liquid separation machine, which is embedded with a sieve plate made from stainless steel having a sieve interval of 0.3-0.4 mm. The sieve plate is provided with an automatic clean water reverse flushing sieve system including a pump and a mobile cleaning sprayer. In the step (iii), the solid leavening is obtained by continuous stirring anaerobic fermentation. In the step (iii), the bio-gas residue and liquid are separated by helical compressor, centrifuge and/or belt pressure filter. In the step (iv), the sewage anaerobic fermentation is carried out by up-flow anaerobic sludge bed or up-flow solid anaerobic reactor. In the step (iii), the solid leavening is fermented at medium temperature of 33-37 degrees C or at high temperature of 53-57 degrees C. In the step (iii), the solid leavening is fermented for 25-30 days at medium temperature and 15-20 days at high temperature.