System of producing power and fuel for farm machinery through biogas methanation

The utility model discloses a system of producing power and fuel for farm machinery through biogas methanation, which consists of a loading device, a fermenter, an air storage tank, a desulfurizer, an air compressor, a dehydrating device, a decarbonization tower, a decarburizated solution regenerating tower, a dehydrant regenerator, a hot-water boiler and a heat exchanger. The dehydrant regenerator consists of an air cooler, a steam-water separator, a circulating fan and an electric heater; the electric heater is arranged on a regenerated gas upgoing pipe; a first regenerated gas down pipe is communicated with the air cooler, a second regenerated gas down pipe is communicated with an exhaust pipe and a third regenerated gas down pipe is communicated with a reflux pipe; the exhaust pipe is communicated with the fuel inlet of the hot-water boiler; the hot-water outlet of the hot-water boiler is communicated with the heat exchanger by a hot-water pipe; the heat exchanger is communicated with the feed inlet of th