NOVELTY - A self-heating, catalytically reforming, and purifying biomass raw fuel gas is performed by filling honeycomb integrated nickel-magnesium solid solution catalyst in catalyst bed layer in reforming furnace; adding oxygen and using heat generated by oxidizing part of raw fuel gas to increase temperature of the reforming furnace, generating steam, tar, and methane, carrying out catalytic reforming reaction, orientated converting into noncondensable combustible gas, and discharging noncondensable combustible gas; and collecting ash.    USE - Method for self-heating, catalytically reforming, and purifying biomass raw fuel gas (claimed).    ADVANTAGE - The method can prepare high level fuel gas, prolong regeneration period and service life of catalyst, save energy, reduce consumption and emission, and realize integrated sustainable utilization of biomass source, energy and environment.    DETAILED DESCRIPTION - Self-heating, catalytically reforming, and purifying biomass raw fuel gas, comprises:    (A) filling honeycomb integrated nickel-magnesium solid solution catalyst in catalyst bed layer in reforming furnace;    (B) adding oxygen to inertial settling biomass high temperature raw fuel gas before entering the reforming device, in which additional amount of oxygen is 3-15 vol.%;    (C) using heat generated by oxidizing part of raw fuel gas to increase temperature of the reforming furnace to 750-850 degrees C, generating steam in the reaction system, tar, and methane, carrying out catalytic reforming reaction to C2 and C3 hydrocarbon compound in the biomass raw fuel gas with carbon dioxide and water on the catalyst bed, orientated converting into noncondensable combustible gas taking hydrogen and carbon monoxide as main components, and discharging noncondensable combustible gas from purified gas outlet on top of the reforming furnace; and    (D) collecting ash generated in the process of reforming and purifying in the ash hopper and timely discharging from the ash outlet.    An INDEPENDENT CLAIM is included for a device for self-heating, catalytically reforming, and purifying biomass raw fuel gas.