The utility model discloses a medical pedicle revision screw component consisting of a screw sheath and a screw which are mutually matched for use; the screw sheath is made of a medical absorbable material and has a certain mechanical strength and toughness, and the medical absorbable material can effectively maintain the mechanical strength to 2-3 months in vivo; the screw sheath is divided into a head end and a sheath body, the head end is a cone with a closed front end, the sheath body is a cylinder, an external thread is arranged on the outer surface of the cylinder, a triangular prism-shaped cavity which extends longitudinally is arranged in the cylinder, the cavity divides the cylinder into three side walls, and an internal thread is designed on the inner wall of the cavity; and the screw is made of medical titanium alloy and consists of a thread section and a tail part, the thread section is formed by connecting a screw tip and a screw body which are designed with the external threads, a U-shaped groove which is through radially is arranged at the tail part, and the internal thread is arranged on the inner wall of the U-shaped groove. The medical pedicle revision screw component can improve the stability and reliability of spinal internal fixation during the revision or the secondary screw placement process, reduce the incidence of loosening and even coming-off of the pedicle screw and reduce the failure rate of an operation.