Automated workover rig for offshore platform and well repairing method

The invention discloses an automated workover rig for an offshore platform and a well repairing method. The workover rig relates to a deck, a drill floor and a derrick and comprises a chassis pipe lifting module, a drill floor pipe feeding and discharging module, a two-layer table pipe coding module, a frame-type supporting column, a small supporting column, a hydraulic control system and a control center. During well repairing, pipe feeding and grabbing of a materiel table are achieved through the chassis pipe lifting module, and pipe lifting and vertical pipe conveying are achieved through apipe feeding mechanical arm; for the drill floor pipe feeding and discharging module, through a pipe feeding and discharging device, pipes are connected and pulled below a drill floor face, rotate by180 degrees, vertically move along a base of the drill floor and are conveyed to a well mouth; the two-layer table pipe coding module is matched with a two-layer table mechanism arm and a drill floormechanical arm through a p