The present invention relates to a fuel control device of an LNG-diesel dual fuel supply system, capable of reducing soot generated in a diesel engine while maintaining output properties of the diesel engine. The fuel control device of an LNG-diesel dual fuel supply system of the present invention comprises: an engine; a diesel injector; an LNG injector; a diesel ECU; an LNG control unit; a dummy injector; a sensor unit including at least one sensor; and a fuel control unit.
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