The invention relates to a recoverable prestressed anchor cable. The recoverable prestressed anchor cable comprises two stranded wires, at least one inner anchor head is connected to each stranded wire, and a bottom plate is arranged at the bottoms of the inner anchor heads and is provided with preformed holes allowing the stranded wires to penetrate connectively. A seal cover is arranged above the bottom plate, an upper gear shaft and a lower gear shaft are arranged inside the seal cover, a left gear set and a right gear set are connected to the gear shafts, each gear set comprises two gears, and circular grooves are formed in the lateral edges of outer races of the gears. The two stranded wires pass through the clearance between the two gear sets and are connected with the two gears of each gear set. When prestress is applied, the two gears on each gear shaft apply opposite torsion to be kept locked through the stranded wires, and at the moment, each gear set is in deadlock, the stranded wires can keep sufficient prestress; after construction is completed, the stranded wires can be detached and recovered conveniently and reused.