Rotary base of multi-joint mechanical arm

The utility model relates to the technical field of multi-joint mechanical arms, in particular to a rotating base of a multi-joint mechanical arm, which comprises a base, a rotating seat body, a rotating disc, a retainer and a driver, the rotating seat body is arranged in the mounting cavity and partially extends to the mounting cavity to be fixed with the mechanical arm; the rotating disc is driven by a motor to rotate and is arranged in the mounting cavity below the rotating seat body; the retainer comprises a magnetic block I and a magnetic block II which are respectively arranged on the base and the rotating seat body, and a magnetic block III and a magnetic block IV which are respectively arranged on the rotating seat body and the rotating disc; and the driver comprises a first magnetic group and a second magnetic group which are respectively arranged on the rotating disc and the rotating seat body. The base and the mechanical arm can rotate in a non-contact mode, long-term stable high-precision operatio