The invention discloses a coal field fire zone coal pressing underground in-situ gasification method. The coal field fire zone coal pressing underground in-situ gasification method comprises steps like determining a coal underground gasification fire source position, transforming an underground coal field fire zone and carrying out coal underground gasification operation. According to the coal field fire zone coal pressing underground in-situ gasification method, a traditional passive fire extinguishing idea is changed, a coal field fire and coal underground gasification technology is combined, a verified coal field fire zone is utilized, the combustion status of a fire source frontal surface is controlled to transform the fire source frontal surface into a coal underground gasification furnace so as to carry out coal underground gasification of the coal field fire zone, coal field fire zone conversion utilization and indirect treatment are realized, and resource waste caused by fire zone coal pressing is reduced. Heat of flames in the coal field fire zone is fully utilized, combustion is reasonably controlled to form the coal underground gasification furnace through transformation, no special ignition well needs to be constructed, a complex ignition process needed by coal underground gasification is avoided, the ignition period is greatly shortened, ignition energy consumptionis greatly reduced, and the method is particularly suitable for treatment of the coal field fire zone.