Constant-resistance anchor rod tray

The invention discloses a constant-resistance anchor rod tray. The constant-resistance anchor rod tray comprises a shell, a piston body and a sidewall protection disc. The sidewall protection disc is fixedly installed on the shell in a sleeving and welded mode. The piston body is installed closely attached to the inner wall of the shell, the piston body and the shell form a closed cavity, a pressure-limiting one-way valve is installed on one side of the cavity and located on the outer wall of the shell, and a center axial hole is formed in the middle of the piston body. One end of an anchor rod penetrates through the center axial hole of the piston body to be fixed to a tunnel wall, and the other end of the anchor rod is closely attached to an anchor rod nut which is arranged on the anchor rod in a sleeving mode. According to the constant-resistance anchor rod tray, because a hydraulic device is adopted, and emulsified oil is injected into the cavity formed by the piston body and the shell so as to absorb and release elastic energy generated by large deformation of tunnel surrounding rock, it is guaranteed that the anchor rod tray is not damaged and can continue providing constant anchoring supporting force for the anchor rod, and the anchor rod still has a good supporting effect under large deformation of the surrounding rock.