Coal underground gasification and pyrolysis integrated oil-hydrogen co-production system and method

According to the underground coal gasification and pyrolysis integrated oil-hydrogen co-production system and method, a lower-layer coal seam horizontal gasification channel is used for receiving a gasification agent from an injection well and gasifying the gasification agent, and raw gas obtained after gasification is conveyed to an upper-layer coal seam horizontal pyrolysis channel through a connecting channel; the upper-layer coal seam horizontal pyrolysis channel is used for performing in-situ heating pyrolysis on the raw gas to obtain an oil-gas mixture and discharging the oil-gas mixture from the production well; the oil-gas treatment unit is used for separating the oil-gas mixture to obtain hydrogen and carbon dioxide mixed gas; and the carbon dioxide trapping unit is used for separating the hydrogen and carbon dioxide mixed gas obtained by the oil gas treatment unit to obtain separated hydrogen and carbon dioxide, and circularly inputting part of the separated carbon dioxide into the injection well. 一