A nanowire light emitting device and a method of fabricating the same are provided. The nanowire light emitting device includes a first conductive layer on a substrate, a plurality of nanowires on the first conductive layer, each nanowire having a p-type doped portion and an n-type doped portion on both ends, a light emitting layer between the p-type doped portion and n-type doped portion, and a second conductive layer formed on the nanowires. The doped portions are formed by adsorbing molecules around a circumference thereof.