NOVELTY - The apparatus (100) has a pre-heater (130) comprising a pre-heating cavity (132), where a reforming reactor (120) is placed inside the pre-heating cavity and the preheating cavity includes a pre-heating cavity inlet (132a) and a pre-heating cavity outlet (132b). A pre-heating pipe (134) is placed inside the pre-heating cavity surrounding the reforming reactor, where an end of the pre-heating pipe is connected to a plasma cavity inlet and another end of the pre-heating pipe passes through the pre-heating cavity inlet connected to a mixing room (142).    USE - Plasma-assisted catalytic reforming apparatus for reforming hydrocarbon gas or hydrocarbon liquid e.g. ethanol and liquefied petroleum gas (all claimed), into hydrogen fuel through catalytic reforming at high temperature. Can also be used for natural gas, methane and butane.    ADVANTAGE - The apparatus allows a recirculation pipe to be arranged to guide a heat source in which a high-temperature reforming reactor is enclosed in the pre-heater so as to effectively utilize the heat source and to reduce volume of the apparatus. The apparatus allows temperature of catalyst beds to be evenly distributed and air and hydrocarbon gas to evenly flow through porous catalyst and to be utilized fully so as to reduce volume of the apparatus and to increase efficiency of reforming of the hydrocarbon gas into hydrogen. The apparatus allows the pre-heating procedure to realize normal operation in a rapid and cost effective manner. The apparatus allows the pre-heater to enclose the reforming reactor, so that temperature distribution of the apparatus decreases gradually from an internal high-temperature reforming reactor to a middle or low-temperature preheater to improve heat utilization and to avoid risk of directly contacting the high-temperature reforming reactor.    DETAILED DESCRIPTION - An INDEPENDENT CLAIM is also included for a plasma-assisted catalytic reforming method for reforming hydrocarbon gas or hydrocarbon liquid into hydrogen fuel through catalytic reforming at high temperature.    DESCRIPTION OF DRAWING(S) - The drawing shows a schematic sectional view of a plasma-assisted catalytic reforming apparatus.    Plasma-assisted catalytic reforming apparatus (100)    Reforming reactor (120)    Pre-heater (130)    Pre-heating cavity (132)    Pre-heating cavity inlet (132a)    Pre-heating cavity outlet (132b)    Pre-heating pipe (134)    Mixing room (142)