External tooth slewing drive with braking symmetrical supports

The invention discloses an external tooth slewing drive with braking symmetrical supports, and belongs to the field of engineering machinery. The external tooth slewing drive comprises a power element, a braking device and a base which are connected in sequence, a driving gear and an external tooth slewing support are installed in the base, and the braking device drives the external tooth slewingsupport to work through the driving gear. A plurality of bearing holes are symmetrically formed in the base with the center axis of the driving gear as the symmetric line, and upper support bearings and lower support bearings are symmetrically installed in the bearing holes respectively with the center axis of the driving gear as the symmetric line. According to the external tooth slewing drive, the driving gear is symmetrically fixed on the base, so that the driving gear can bear larger tangential force and radial force under the same tooth width, and meanwhile, an output shaft of the power element is prevented from