A composite electric generating set comprises a first magnet, a first coil, a second magnet, a send coil, and multiple gears. The first coil is disposed around the first magnet, so that an induced current can be generated when the first magnet rotates. The second magnet is located outside a housing of the first coil, so that when the first coil and the second magnet rotate, the rotation direction of the second magnet is opposite to that of the first magnet. The second coil is disposed around the second magnet, so that an induced current can be generated when the second magnet rotates. The multiple gears are disposed between the housing of the first coil and the second coil, so that the rotation direction of the second coil is same as that of the first coil.