The utility model relates to a length-adjustable orthodontic clamp frame which comprises limiting supporting plates arranged in parallel, a plurality of sliding sleeves arranged between the limiting supporting plates, a plurality of limiting mechanisms arranged on the sliding sleeves and used for placing orthodontic clamps, and sliding damping assemblies and limiting fixing pieces arranged on the sliding sleeves, the sliding sleeve comprises an outer supporting
pipe and an inner adjusting
pipe which are arranged in a sliding and nested mode. The sliding damping
assembly comprises a connecting cylinder arranged on the inner wall of the outer supporting
pipe, a friction ball arranged at an opening of the connecting cylinder in a rolling mode and a spring elastically connected between the friction ball and the bottom of the connecting cylinder in an abutting mode. The limiting fixing piece is used for fixing the outer supporting pipe and the inner adjusting pipe. Compared with the prior art, the utility model not only is convenient to assemble and disassemble, but also is adjustable in length and stable in adjusting process, and improves the adaptability of the device in different use scenes.