An orthodontic fixing apparatus is provided, wherein the apparatus includes a linear fixing body, bisymmetrically defined, having a plurality of connection grooves in each left and right sides thereof, and a plurality of cylindrical fixing rings arranged on the upper and lower sides of the central portion of the fixing body with a connection member being placed between the upper and lower sides, wherein a screw is inserted, to thereby fix the fixing body to the palate. Each fixing ring may protrude by a width of 0.1 mm to 4 mm in a direction of contact with the palate to minimize the contact of the fixing ring or the fixing body with the palate. The fixing ring may include a taper having a diameter that gradually decreases from an inlet to an outlet along an insertion direction of the screw, wherein an internal thread is arranged in the fixing ring.