The invention discloses a universal seat rotating mechanism which comprises a base, a motor is fixed in the base, a motor shaft penetrates through the base, a locking device is installed on the motor shaft, a synchronizer is installed in cooperation with the locking device, a sliding ring wire connector and a rotating disc are arranged on the base, and an adaptive support is fixed to the rotating disc. The locking device comprises a movable locking device and a fixed locking device, the movable locking device is arranged on the fixed locking device and matches the movable locking device through a groove and a protrusion, the synchronizer matches the movable locking device through a special-shaped concave-convex structure, the rotating disc comprises a fixed connecting ring and a movable connecting cylinder, the fixed connecting ring is sleeved with a concave ring of the movable connecting cylinder, the fixed connecting ring is fixed to the outer edge of the base, the adaptive support is fixed on the movable connecting cylinder, and the locking device is exposed through a hollow area on the adaptive support. The base is allowed to be not coaxial with a rotating part of an automobile seat, manufacturing and assembling errors can be compensated, and meanwhile selection of the type of the locking device is increased.