Abstract: Disclosed is a fuel activation apparatus using a magnetic body, capable of ionizing fuels so as to obtain high combustion efficiency for a liquid or gas fuel. In the fuel activation apparatus, a fuel activation member of a magnetic material to make the fuels rotatably flow is inserted into the inner side of a fuel activation duct through which the fuels flow. A magnetic body is disposed on the external side of the fuel activation duct. A magnetic induction layer encloses the magnetic body and the fuel activation duct. Further, a magnetic shield layer is disposed in the external side of the magnetic induction layer. Thus, the ionization of the fuels which flow through the fuel activation duct is maximized, thereby heightening the combustion efficiency of the fuels.