The slewing drive is a full-cycle rotary reduction transmission mechanism integrated with a driving power source. The slewing bearing is used as a transmission follower and a mechanism attachment member, and an active member and a driving source are attached to one of the inner and outer rings of the slewing ring
. And the casing, and the other ring is regarded as both the transmission follower and the connecting base of the driven working part, so that the slewing bearing itself is a feature of the full-circle rotary connecting member, and the driving power source and the main transmission are efficiently configured. The part makes it a general-purpose reduction transmission mechanism that integrates the functions of rotation, deceleration and drive, while having a simple structure and convenient manufacture and maintenance.