The invention discloses a thread self-locking combined anchor bolt. The thread self-locking combined anchor bolt comprises an inner rod and an outer rod; a rod body of the inner rod is provided with an outer screw thread section, and a countersunk head is disposed at the inner end of the inner rod; an inner threaded hole is formed in a rod body of the outer rod; the countersunk head is an eccentric countersunk head or a center countersunk head or a combined countersunk head of which the center part and the eccentric part are combined; the outer rod and the inner rod are made to be in threaded connection by operating the spiral part of the outer end of the outer rod, so that the eccentric countersunk head is embedded into a to-be-anchored anchor hole for locking, or the center countersunk head cooperates with an expanding part between the inner ends of the outer rod to cause expansion and to be embedded into the to-be-anchored anchor hole, or the center part of the combined countersunk head cooperates with the expanding part between the inner ends of the outer rod to cause expansion and to be embedded into the to-be-anchored anchor hole, and the eccentric part of the combined countersunk head is embedded into the to-be-anchored anchor hole for double locking; accordingly, the anchoring function is achieved, actual effect cannot be achieved even after repeatedly dismantling, the service life is longer, and the safety performance is higher.