Segmented displacement multi-stage control negative Poisson self-expansion anchor rod device

The invention provides a segmented displacement multi-stage control negative Poisson self-expansion anchor rod device. The problems that in the prior art, anchor rod force bearing points are insufficient, locking section force bearing points are prone to damage, and finally the effect of an anchor rod is poor and even fails are solved. According to the scheme, the anchor rod device comprises an anchoring end, a plurality of circular truncated cone bodies which are large outside and small inside in the axial direction are arranged on the axial outer side of the anchoring end at intervals, the axial inner ends of the circular truncated cone bodies are coaxially connected with tensile force bodies, penetrating holes which penetrate through the tensile force bodies inwards in the axial direction are formed in the axial outer ends of the circular truncated cone bodies, the tensile force body at the axial innermost end is fixed to the anchoring end, the tensile force body on the axial outer side penetrates through