The invention discloses a turning device, in particular a turning device for a crawler crane, which comprises a gear ring (1). The turning device is characterized in that: the circumference of the gear ring (1) is provided with a ring groove (9); an upper ring (5) is arranged in the ring groove (9), and at least two circles of anti-pressing rolling bodies are arranged between the bottom of the upper ring (5) and the bottom of the ring groove (9); a separating ring (2) is arranged between the inner ring anti-pressing rolling body and the adjacent outer ring anti-pressing rolling body; and an outer sealing ring (6) is arranged at the outer side of a groove opening of the ring groove (9) on the outer circumference of the gear ring (1), an outer ring anti-overturning rolling body (8) is arranged between the outer sealing ring (6) and the upper ring (5), and an outer ring radial rolling body (4) is arranged between the upper ring (5) and the inner side of the outer edge of an upper opening of the ring groove (9). Compared with the prior art, the device has the advantages of simple overall structure, low manufacturing cost, low use cost, convenient use, easy disassembly, strong vertical bearing load capacity and strong anti-overturning capacity.