NOVELTY - A thin micro reforming apparatus comprises: a substrate (10) having a flow path; fuel a inlet (20) allowing fuel to flow through a channel (23), and preheating the fuel; an evaporator (30) having a flow path for gasifying liquid fuel; a reformer (40) for reforming fuel into hydrogen gas via heat absorption reaction; a carbon monoxide (CO) remover (60) for removing CO gas contained in the hydrogen gas; and a cover for the upper part of the substrate to seal the flow path of the substrate from the external environment, where the fuel flowing through the channel is heated.    USE - Used in a fuel cell system for electronic devices, e.g. mobile phones, Personal Digital Assistants (PDAs), digital cameras, and notebook computers.    ADVANTAGE - The apparatus improves heat efficiency and enables reformation of the fuel and removal of CO in a single sheet of substrate. It allows fuel to absorb heat from a CO remover while passing through a channel of a fuel inlet portion without requiring additional heat supplied to an evaporator, reducing overall heat supply; and allows liquid fuel to exchange heat while passing through a reformer and a CO remover and enter an evaporator in a pre-heated state, maintaining optimal reaction temperatures at respective parts to improve reaction efficiency. The reforming apparatus is designed to allow chemical reactions to take place in a single sheet of substrate and allows heat exchange among an evaporator, reformer and a CO remover rather than using insulation material between layers, realizing a thin structure reduced in the thickness and advantageous for integration into a fuel cell system without requiring difficult bonding of multiple layers. It has a channel of a fuel inlet portion extended along a periphery of a substrate to surround an evaporator, reformer and a CO remover, easily insulating side portions of the substrate.    DESCRIPTION OF DRAWING(S) - The figure is an exploded perspective view illustrating a thin micro reforming apparatus.    Substrate (10)    Fuel inlet (20)    Channel (23)    Evaporator (30)    Reformer (40)    CO remover (60)