The invention relates to the field of engineering equipment, and specifically relates to a rotation device. The rotation device comprises a support device, a drive device, a rotation device and a large gear, wherein the drive device is connected with the support device; the rotation device is connected with the support device; the large gear is connected with the rotation device; the large gear comprises a circumferential surface; the drive device comprises a pinion and a rolling mechanism; the pinion is engaged with the large gear; and the rolling mechanism moves along the circumferential surface of the large gear. In this way, instable working caused by separation of the pinion and the large gear due to the engagement can be avoided, an impact is avoided, a weight is reduced, the stress condition of the engagement of the pinion and the large gear is improved, the service life is prolonged, and the purposes of reducing cost and increasing efficiency are achieved.