The invention discloses a rotary support structure which comprises a rotary body and a shaft hole, wherein an outer upper ring is arranged outside the rotary body in a sleeving way; an outer lower ring is arranged below the outer upper ring, a 45-degree inclined surface is arranged at the lower end of the inner side of the outer upper ring, a 45-degree inclined surface is also arranged at the upper end of the inner side of the outer lower ring, connecting holes are formed in both the outer upper ring and the outer lower ring, friction plates are arranged between the outer upper ring and the rotary body and between the outer lower ring and the rotary body, stainless steel rings are embedded in the inner sides of the outer upper ring and the outer lower ring, V-shaped grooves are formed in the middle of the rotary body and form square holes with the inclined surface, and steel balls are arranged in the square holes; the shaft hole is formed in the inner side of the rotary body, a key groove is formed in the shaft hole, a rotating arm is fixedly connected with the edge on one side of the bottom of the rotary body, a flange is arranged at the top end of the rotary body, and a connecting hole is formed in the flange. The rotary support structure is simple and reasonable, lower in energy consumption and lower in cost and satisfies the use demands, thereby having a wide market prospect.