An apparatus for providing a multi-voltage output of a low voltage DC-DC converter of an eco-friendly vehicle may include a transformer converting AC power of the high voltage into AC power of a first voltage, a rectifying unit generating the AC power of the first voltage as DC power of a first voltage, a first voltage output unit supplying the first voltage to a first electric field load of the eco-friendly vehicle from the DC power of the first voltage, a converter converting the DC power of the first voltage into DC power of a second voltage having a voltage value different from the first voltage, and a second voltage output unit supplying the second voltage from the DC power of the second voltage to a second electric field load.