A magnetically balanced electric generator is provided, which includes a rotor rotating, a fixing structure having a fixing axis, a rotating magnet body movably coupled with the fixing axis, and engaged with the rotor, a power-generating block vertically separated from the rotating magnet body, a first magnet mounted along the circumference of the rotating magnet body, a second magnet mounted along the circumference of the power-generating block, power-generating magnets mounted in the rotating magnet body and rotating about the fixing axis upon rotation of the rotating magnet body, power-generating units mounted in the power-generating block to generate electricity because of interaction with the power-generating magnet, and a gap control unit moving the rotating magnet body with an interaction of an external force to control a gap between the rotating magnet body and the power-generating block.