The present invention relates to a skin treatment apparatus using fractional plasma, in which a plasma generator includes an electrode plate, a dielectric body, a pin holder, a plurality of pins, and a gap maintaining part and further includes a lower support which includes a pin cover, vents, and an auxiliary gap maintaining part. According to the present invention, the plurality of pins are configured as independent electrodes to prevent concentration of plasma, ends of the plurality of pins are pointed to more smoothly generate plasma, the distances between the plurality of pins may be more reliably maintained using the pin cover, plasma generated by the plurality of pins may be evenly emitted onto the skin via the pin cover and vents without being concentrated on a curved region of the skin, and the auxiliary gap maintaining part moves in a vertical direction of the gap maintaining part to adjust a distance between the plurality of pins and the skin.