NOVELTY - A methane system in livestock farm, comprises a pollutant collecting tank, a deploying tank, a desilting channel, a regulating tank, an integrated reactor, a concentrated tank, an organic processing room, a liquid storage tank, a methane liquid pipe, a gas-water separator, a booster fan, a back-fire relief valve, a methane residue pipe and a feeding pipe.    USE - As methane system in livestock farm (claimed).    ADVANTAGE - The methane system avoids residue and biogas slurry discharged together; has simple structure, safe and reliable performance, and long service life; and can effectively separates the biogas slurry and biogas residue completely, the separated biogas is used for irrigating farmland, and residue is used for producing organic fertilizer; and provides an effective path of improving the environmental sanitation in countryside and developing the green planting industry and cultivation industry.    DETAILED DESCRIPTION - A methane system in livestock farm, comprises a pollutant collecting tank, a deploying tank, a desilting channel, a regulating tank, an integrated reactor, a concentrated tank, an organic processing room, a liquid storage tank, a methane liquid pipe, a gas-water separator, a booster fan, a back-fire relief valve, a methane residue pipe and a feeding pipe, where the pollutant collecting tank, the deploying tank, the desilting channel and the regulating tank are connected by a pipeline orderly; the outlet end of the regulating tank is connected with the inlet end of the integrated reactor by the feeding pipe; the first outlet of the integrated reactor is connected with the inlet end of the condensed tank by the methane liquid pipe; the outlet end on the bottom of the concentrated tank is provided with the methane residue pipe; the methane residue pipe is provided with a conveying pump; the outlet end of the methane residue pipe is connected with the inlet end of the organic processing room; the outlet end of the organic processing room is connected with the inlet end of the liquid storage tank; the second outlet of the integrated reactor is connected with the inlet end of the water-gas separator; the outlet end of the water-gas separator is connected with the inlet end of the booster fan by the pipeline; and the outlet end of the booster fan is connected with the cooker of the farmer by the pipeline.