NOVELTY - Recycling multiple biogas slurry components comprises adding magnesium salt and phosphate in the biogas slurry, stirring and standing for sediment, adding flocculant, stirring and flocculating the slurry, pumping the slurry into a separator, separating residue, matching, prilling and drying the residue to organic fertilizer, sterilizing liquid, adding nutrient substance to the slurry and feeding culturing tank, separating algae, washing, drying and crashing to prepare a feed, taking rest liquid to produce liquid fertilizer, adding nutrient substance, adjusting pH value, and filtering.    USE - The method is useful for recycling multiple biogas slurry components (claimed).    ADVANTAGE - The method efficiently recycles the multiple biogas slurry components with high integrated utilization rate thus improving income and return rate of biogas.    DETAILED DESCRIPTION - Recycling multiple biogas slurry components comprises adding magnesium salt and phosphate for detecting ammonia-nitrogen concentration in the biogas slurry according to the generation principle of struvite, where a molar ratio of ammonia-nitrogen, magnesium ion and phosphate anion is 1:1:1, sufficiently stirring the mixture, standing and stewing the mixture for depositing sediment, adding a flocculant to the biogas slurry, uniformly stirring and sufficiently flocculating the biogas slurry, pumping the flocculated biogas slurry into a solid-liquid separator, separating the biogas residue from the separator, matching, prilling and drying the separated biogas residue to prepare granule organic fertilizer, sterilizing the clear liquid, adding part of nutrient substance to the biogas slurry and feeding into an algae culturing tank, separating the algae by a separator, washing, drying and crashing the algae to prepare a protein feed, taking the rest liquid after algae treatment as the mother liquor for producing liquid fertilizer, adding the nutrient substance to the liquid fertilizer, adjusting the pH value, and then superfine filtering the mixture.    DESCRIPTION OF DRAWING(S) - The diagram shows a schematic flowchart of a method for recycling multiple biogas slurry components (Drawing includes non-English language text).