The Slewing drive is a full-circle rotary deceleration transmission mechanism that integrates a driving power source. It uses a slewing bearing as a transmission follower and a mechanism attachment. The driving source and the casing, and the other ring is used as both the transmission follower and the connection base of the driven working part, so that the slewing bearing itself is a full-circumference slewing connection, and the driving power source and The main transmission parts make it a universal deceleration transmission mechanism that integrates the functions of rotation, deceleration and driving, and at the same time has a simple structure and is convenient to manufacture and maintain.