Provided are a C-arm X-ray imaging apparatus and a base for the apparatus, the base comprising a drive member, a horizontal portion and a sunk portion. The sunk portion comprises a rotary disc connected to the horizontal portion and the drive member, and an upper surface of the rotary disc is flush with or lower than a lower surface of the horizontal portion. The rotary disc is configured to be rotatable about its center of rotation under the driving of the drive member so as to drive the base to rotate.
