A fuel combustion enhancement apparatus of an internal combustion engine, which is capable of greatly reducing fuel and improving combustion efficiency and torque and reducing exhaust gas, includes a power source terminal, a conductor plate 10 for gas activation, an amplifier 30, and a gas activation enhancement device 20 which includes a frequency resonance coil power source 22, a local oscillation power source, a detection circuit 23, a power amplification circuit 24, a power amplification IC 27, and an amplifier power source 28 connected between the power source terminal and the conductor plate. The conductor plate 10 includes a coil unit 12, and copper plates 14 are electrically connected between both ends of the coil unit 12, and auxiliary plates 16 made of materials having a different standard electrode potential value from materials of the copper plates are disposed at bottoms of the copper plates 14.