TECHNOLOGY FOCUS - BIOLOGY - Preferred Method: The method of adding livestock and poultry waste and crops straw for anaerobic dry fermentation to produce biogas, biogas residue and biogas slurry is achieved by mixing livestock and poultry waste and crop straw according to ratio, placing in an anaerobic fermenting tank, adjusting moisture, pH and particle size, adding activated sludge and the fermentation microbial inoculum, carrying out anaerobic dry fermentation for producing biogas, biogas residue and biogas slurry. The method for using biogas slurry as inoculum is achieved by placing small amount of biogas produced by anaerobic fermentation and materials in a ratio of 1:3-9 in a fermentation tank as inoculum. The dynamic fermenting and composting method of biogas residue and fresh livestock and poultry excrement in dynamic fermentation tank comprises mixing the biogas residue with fresh livestock and poultry excrement according to ratio, adding into dynamic fermenting tank, fermenting for many days according to weather condition, maintaining the fermentation temperature at 60 degrees C by a rotary type turning method, mixing fresh excrement and excrement biogas residue, water conditioning agents, and microbial inoculation agent. The moisture content in material of dynamic fermenting and composting is reduced from 65% to 40%. The method of carrying out static fermentation and composting method is achieved by completing the dynamic fermentation and composting and transferring material to the static compost field, loading material in vehicle and stacking to a height, subjecting to forced ventilation for every seven days a time, and carrying out static composting and fermentation. The moisture content of the material is reduced to 30% in static fermentation and composting. The method further comprises material circulation process and the energy circulation process, where the material circulation process specifically comprises carrying out anaerobic fermentation by using dry fermentation technology for producing biogas, adding biogas fermenting residue into organic fertilizer for crop production and after anaerobic dry fermentation, the biogas slurry is collected via groove of biogas slurry collecting pool and recovering as inoculum through strain preparation device and strain spraying device and using for fermentation; the energy circulation process specifically comprises anaerobically dry fermenting to generate biogas, passing via gas safety monitoring system, biogas automatic control system, biogas purification device and entering into gas storage tank, and using for generating power, recycling, then using power generation for waste heat recovery in anaerobic fermentation and organic fertilizer dynamic fermentation tank heating, using electric energy in wet and dry livestock excrement separation, straw crushing, stirring the material and energy consumption of the machine processing equipment for biological organic fertilizer, and realizing energy circulation; the material circulation further comprises a raw material preparation process, an anaerobic dry fermentation process of organic fertilizer fermentation process, where the raw material preparing process specifically comprises using livestock and poultry excrement dry-wet separator for livestock and poultry excrement dry-wet separation until the water content is 60% and using for dynamic fermentation, crushing straw using straw crusher for 0.5-3 cm powder, transporting fresh pig manure and straw dry powder by a vehicle into dry-type anaerobic fermenting tank, where the anaerobic dry fermentation process comprises adding agricultural waste into anaerobic fermenting tank and stirring uniformly, entering produced biogas into tank, and biogas slurry into biogas slurry collecting tank, and biogas residue organic fertilizer used for the next dynamic fermentation process, using heating pipes in cold season and shortening fermentation period; the organic fertilizer fermenting process specifically comprises adding biogas residue and livestock and poultry waste into a dry-wet separator for anaerobic fermentation, adding straw powder according to ratio in a dynamic fermentation tank, carrying out dynamic fermentation, maintaining the material temperature to 60 degrees C, turning for 10-15 days until the material stack water content is 40%, transferring to the static storage yard, turning once every 5-7 days, until the water content reaches 30%, and obtaining as organic fertilizer finished product, using heating pipe for heating during low temperature season and shortening fermentation period.