System for producing power fuel for agricultural machinery by adopting biogas methanation way

The invention relates to a system for producing power fuel for agricultural machinery by adopting a biogas methanation way. The system comprises a feeding device, a fermentation tank, a gas storage tank, a desulfuration device, a gas compressor, a dewatering device, a decarburization tower, a decarburization liquid regeneration tower, a dehydrant regeneration device, a hot water boiler and a heatexchanger, wherein the dehydrant regeneration device comprises an air cooler, a steam-water separator, a circulating fan and an electric heater; the electric heater is arranged on a regenerated gas uplink pipeline; the first path of a regenerated gas downlink pipeline is communicated with the air cooler, the second path thereof is communicated with a tail gas pipeline, and the third path thereof is communicated with a reflux pipeline; the tail gas pipeline is communicated with a fuel inlet of the hot water boiler, a hot water outlet of the hot water boiler is communicated with the heat exchanger through a hot water pi