A large precise magnetic levitation direct-drive rotating workbench comprises a driving motor of a rotating workbench body, an angular displacement feedback system, a radial active type bias magneticlevitation bearing, an axial active type bias magnetic levitation bearing, an axial protecting bearing and a radial protecting bearing; the rotating workbench body and the active type bias magnetic levitation bearings restraining the axial movement and the radial movement of the rotating workbench body are arranged, and the protecting bearings, braking devices and a position feedback system are arranged; and a signal of the position feedback system is output to a control system to control the driving motor an the braking devices. The large precise magnetic levitation direct-drive rotating workbench is characterized in that the rotating workbench body achieves magnetic levitation supporting through the active type bias magnetic levitation bearings, and the rotating workbench body is directly driven through a permanent magnetic synchronous torque motor. According to the large precise magnetic levitation direct-drive rotating workbench, friction of mechanical bearings is eliminated, machining and assembling are easy, and the transporting and maintaining cost is low. The revolution precision is high, the bearing capacity is high, power consumption is low, no crawling is caused during ultra-low-speed operation, and the large precise magnetic levitation direct-drive rotating workbench can be widely applied to the fields of astronomical observation instruments, numerical control machine tools, radars, precise rotating tables and the like.