A skin treatment device is provided, which includes a needle frame in which a front end outlet of a needle that penetrates an inside thereof projects toward a front thereof, a rear end inlet of the needle is open to an outside of a rear surface thereof, and a stepped partition wall is provided in a closed shape on the outside of the rear surface thereof so that the rear end inlet of the needle is positioned inside the partition wall； a needle cover having a space portion formed on a rear thereof toward an inside thereof, a needle guide portion formed on a front surface thereof to communicate with the space portion and penetrated by the needle, and an insertion portion formed on a bottom surface thereof； a contact PCB configured to receive a power that is supplied from a power supply device, provided with a contact hole penetratingly formed on a front surface thereof so that the needle can penetrate the contact hole, and configured to apply positive electricity or negative electricity according to the power supply to the needle that penetrates the contact hole； and a needle hub having an insertion portion formed in a front thereof toward an inside thereof, an injection portion formed on an outside of a rear surface thereof to be connected to a syringe, and a path provided on an inside of the rear surface thereof to communicate with the insertion portion and to be inserted into an inside of the partition wall of the needle frame that is positioned inside the insertion portion, so that one front portion thereof is inserted into and coupled to the space portion of the needle cover in a state where the contact PCB and the needle frame are successively provided inside the partition wall of the needle frame.
