A support frame of a panel TV set comprises a wallboard (1), an upper main support arm (2), a lower main support arm (3), an auxiliary support arm (4), a small connector (5), a large connector (6), an adjusting handle (7), a connecting piece (8) and elongated bars (9), wherein the auxiliary support arm (4) can rotate relative to the upper main support arm (2) and the lower main support arm (3) by approximately 360-degrees, so as to achieve the design objectives.