Joint support structure

The invention provides a joint support structure which comprises an upper support, a lower support and a rotary shaft limiting device. The upper support and the lower support are respectively provided with a plurality of fixing belts, the rotary shaft limiting device is connected between the upper support and the lower support and is respectively provided with an upper shaft portion fixedly connected with the upper support and a lower shaft portion fixedly connected with the lower support, the upper shaft portion and the lower shaft portion are mutually pivoted and combined, the upper shaft portion is provided with a fine angle control driving lever in a pivoted mode, an embedment tooth portion is formed at the lower end of the fine angle control driving lever, a pressing portion is formed at the upper end of the fine angle control driving lever, a limiting portion is convexly arranged on the fine angle control driving lever, and an elastic jacking element is arranged in the position, corresponding to the fin