NOVELTY - A micro-macro channel reactor (10) comprises top end plate (20) and bottom end plate (60), heat exchanging plate (30) having passages (32), catalyst plate (40) stacked and assembled together with heat exchanging plate, where catalyst plate has catalyst section (41) carrying reaction catalyst that is necessitated to perform catalytic reaction of reactant while reactant is passing through catalyst section; and support plate (50) stacked and assembled together with catalyst plate, where support plate has passages through which reactant flows to reach catalyst section of catalyst plate.    USE - As micro-macro channel reactor (claimed), useful for a fuel reforming apparatus for small-sized fuel cell; in compact fuel reformer, hydrogen station for fuel cell powered vehicle, and clean fuel manufacturing process for producing GTL (gas-to-liquid), CTL (coal-to-liquid), BTL (biomass-to-liquid), DME (dimethyl ether), or MeOH (methanol); and in GTL-FPSO (floating production storage and offloading), DME-FPSO, and MeOH-FPSO processes.    ADVANTAGE - The micro-macro channel reactor easily increases the specific surface area of a catalyst necessary for a reaction, thus maximizing the performance and heat exchanging efficiency of the catalyst. The micro-macro channel reactor solves problems of lowering the activity of a reactant due to non-uniform distribution, pressure increase, and pressure change of the reactant; enhances the heat transfer characteristics and heat exchanging performance of a reaction, thus enhancing the efficiency of the reaction; provides small-sized compact reactor by uniformly distributing a reactor, increasing the flux of the reactant, maximizing the performance of a catalyst, and enhancing the efficiency of the reactor.    DETAILED DESCRIPTION - A micro-macro channel reactor (10) comprises top end plate (20) and bottom end plate (60), where each end plate is disposed on outermost portion of micro-macro channel reactor; a heat exchanging plate (30) having passages (32), through which a heat exchanging material flows; catalyst plate (40) stacked and assembled together with heat exchanging plate, where catalyst plate has a catalyst section (41) carrying a reaction catalyst that is necessitated to perform catalytic reaction of reactant while the reactant is passing through the catalyst section, where the reactant and/or resulting product is configured to heat-exchange with the heat exchanging material passing through heat exchange plate; and a support plate (50) stacked and assembled together with the catalyst plate, where the support plate has passages through which the reactant flows to reach the catalyst section of the catalyst plate, where the heat exchanging plate, the catalyst plate, and the support plate are stacked and assembled between the top end plate and bottom end plate.    DESCRIPTION OF DRAWING(S) - The figure shows an exploded perspective view of micro-macro channel reactor.    Micro-macro channel reactor (10)    Top end plate (20)    Heat exchanging plate (30)    Passages (32)    Catalyst plate (40)    Catalyst section (41)    Support plate (50)    Bottom end plate (60)