The invention sikimeuroseo the weights (WEIGHT) side of the crane main body smoothly dispersed by a load applied to the rotary ring to the balance-compensation apparatus, extends the life of the equipment by minimizing metal frictional force occurring during rotation and stable facilities rotation of the crane for operation relates to a ring-compensation apparatus, the present invention is the upper body (2) of the 360 ​​° rotation the rails of circular 10, which is attached to the upper body (2) to facilitate the said rail (10) while supporting the upper body (2 ) made of a compensation device (20) to keep the shock absorbers, phase, and balance of the compensation device 20 has a cylindrical guide (24) provided in the upper portion of the foot plate 26 and the plate-shaped; And the support (22) joined to the upper portion of the guide 24; Is interposed on the support 22, which is coupled to the guide 24 and the spring 25 for holding the upper and lower impact and balance of the upper body (2); The support (22) a pair of support plates (23) provided in the upper and; Is supported on the support plate (23) of the pair, the rollers (21) in direct contact with the rotating ring (5) and; And the guide (24) is installed on one side of the limit switch 27 for detecting the buffering action of the spring 25; Phase by the detection of the limit switch 27, and a plurality of cylinders (28) acting in the downward direction. Cranes, rotating ring, balance, compensation, rail