NOVELTY - Producing concentrated organic compound containing liquid fertilizer from biogas slurry at room temperature comprises e.g. transporting the biogas slurry that does not generate biogas methane, to a biogas filter tank through a self-sucking pump (5), filtering out large particles of sand, plant fibers and other substances in the biogas slurry storage tanks for the sedimentation process, transporting the precipitation treated biogas slurry liquid into biogas slurry mechanical filtration devices and slurry multi-media filtration devices to filter out e.g. organic suspended solids.    USE - The method is useful for producing concentrated organic compound containing liquid fertilizer from biogas slurry.    ADVANTAGE - The whole production process is carried out at normal temperature, using physical method of the multi-layer filtering and concentrating and separating, the organic nutrient content in the liquid fertilizer is not changed.    DETAILED DESCRIPTION - Producing concentrated organic compound containing liquid fertilizer from biogas slurry at room temperature comprises transporting the biogas slurry that does not generate biogas methane, to a biogas filter tank through a self-sucking pump (5), filtering out large particles of sand, plant fibers and other substances in the biogas slurry storage tanks for the sedimentation process, transporting the precipitation treated biogas slurry liquid into biogas slurry mechanical filtration devices and slurry multi-media filtration devices to filter out organic suspended solids, plant fibers and other large particles and free chlorine, pesticide residues and organic pollutants, then filtering out bacteria, sand, clay and algae and macromolecular substance through a precision filter device, filtering organic macromolecules, humic acid and colloidal slurry through a cross-flow ultrafiltration device and transporting into a concentrated liquid storage tank, then conveying to an aromatic polyamide membrane element concentrating device through a high pressure liquid transmission pump, filtering the concentrated solution and storing in a concentrated solution storage tank and transporting the separated water into a water storage tank, using water in the water storage tank for cleaning equipment, transporting the concentrated biogas liquid mixture in the tank of biogas slurry concentrate to the biogas slurry liquid tank by a delivery pump, adding a certain amount of nutrients according to the type of crops, to the biogas slurry liquid tank and mixing, and transporting to the concentrated organic compound containing liquid fertilizer storage tank, then transporting the liquid fertilizer to a high level tank through an online sterilizing device, then transporting to liquid fertilizer balancing tank for balancing liquid weight and transporting to a packaging machine through a conveying pump. An INDEPENDENT CLAIM is also included for a device for producing concentrated organic compound containing liquid fertilizer from biogas slurry.    DESCRIPTION OF DRAWING(S) - The figure shows a schematic representation of a device for producing concentrated organic compound containing liquid fertilizer.    Slurry sedimentation tank filter screen (2)    Liquid sedimentation tank self-sucking pump (5)    Two sedimentation tanks (6)    Biogas slurry filter tank (11)    Biogas liquid tank (13)