Recyclable anchor rod

The invention discloses an anchor rod for foundation pit support engineering, in particular to a recyclable anchor rod. The recyclable anchor rod comprises a hollow anchor rod and a central anchor rod, and a water injection gap is formed between the hollow anchor rod and the central anchor rod; the hollow anchor rod is provided with multiple arched hinged sheet groups arranged along the axis of the hollow anchor rod; the end part of one side of the central anchor rod extends out of the hollow anchor rod, and a drill head is formed and fixed with the hollow anchor rod; the end part of the otherside of the central anchor penetrates through a locking screw cap, and under the driving of the locking screw cap, the central anchor rod drives the hollow anchor rod to compress; first hinge sheetsand second hinge sheets in the multiple hinge sheet groups are mutually arched; each hinge sheet group is wrapped with a waterproof cloth sleeve; and high-pressure water bodies can be injected into the water injection gap betw