The present invention relates to a skin treatment apparatus using plasma, in which a plasma generator includes an electrode plate an upper dielectric body independent electrode parts and a lower dielectric body. The independent electrode parts are a plurality of pieces of silver paste or flexible printed circuit boards (FPCBs) which are spaced a certain distance apart from each other. According to the present invention, electrode parts operate independently to prevent a plasma concentration phenomenon and uniformly generate plasma. According to the present invention, a plasma generator configured as described above is easy to form in a convex shape, and a convex plasma generator is applicable to a curved region of the skin to be treated, e.g., a palm. Furthermore, the convex plasma generator is capable of more uniformly generating plasma and is particularly effective for treatment of a long and round cylindrical object to be treated, e.g., the vagina of a woman.