Disclosed is an injection needle for plastic surgery prefilled with one or more surgical threads for wrinkle removal. The injection needle for plastic surgery is designed to have a sharp tip through which the surgical threads are inserted into a human body and a hollow cylindrical injection portion accommodating the surgical threads therein. Each of the surgical threads is 0.8 to 10 cm long and has a plurality of projections in different directions. The projections are symmetrically formed with respect to the axis of the thread to gather soft tissues of the skin or to stretch epidermal tissues.
