According to the present invention, the end of the cover member is coupled to the inner circumferential surface of the slot groove by the locking coupling method, and the fixing method of the calibration wire in the state where the calibration wire is accommodated in the slot groove of the bracket body is an active type or a passive type as necessary. It relates to an orthodontic bracket with improved structure for selection. The present invention includes a base portion attached to the user's teeth； Slot grooves are formed on the front surface of the base portion and a calibration wire is inserted into the front surface thereof, and a recess groove is formed in the slot groove so as to allow movement of the calibration wire, and the lower front surface is provided below the slot groove. A bracket body having guide grooves into which one end of the cover member is fitted at both left and right sides thereof； One end is fixed to the guide groove formed on the lower front of the bracket body, the other end is elastically bent and becomes a free end that can enter the slot groove by an external pressing force, the passive position according to the external pressing force according to the touch of the other end Or a cover member which is selectively locked to the first and second locking protrusions by alternately rotating in an actuated position； A first locking protrusion formed to protrude on an inner circumferential surface of the slot groove at a position proximate to the concave groove side of the slot groove so as to be spaced apart from the inlet of the slot groove than the second locking protrusion formed on the upper portion of the bracket body； A second locking protrusion protruding longer than an end length of the first locking protrusion on an inner circumferential surface of the slot groove closer to the opening inlet side of the slot groove than the first locking protrusion； And an angle adjusting means for adjusting an angle of the other end of the cover
