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The invention relates to a recyclable expansion anchor rod and a construction method thereof. The recyclable expansion anchor rod comprises an anchor head, a rod body, a protecting bag and a rod body protecting tube; the anchor head is composed of a screw, a herringbone expanding head, a spiral steel wire, a steel wire protecting tube and an anchoring piece; the herringbone expanding head is screwed in the screw; the spiral steel wire penetrates the herringbone expanding head to extend into the steel wire protecting tube; the steel wire protecting tube sleeves the screw; the anchoring piece is mounted at one end of the rod body; the rod body is composed of a plurality of equidistantly arranged steel strands, steel strand position fixing parts and steel strand tensioning parts, and the steel strands are respectively fixed on the anchoring piece, the steel strand position fixing parts and the steel strand tensioning parts; the protecting bag is arranged outside the anchor head; the rod body protecting tube sleeves the rod body and are in butt joint with the protecting bag. The recyclable expansion anchor rod and the construction method thereof have the advantages that simpleness in structure, convenience in mounting, repeated use and low cost are achieved and the like.