The invention relates to the technical field of axial force monitoring of an anchor rod supporting structure of tunnel engineering, in particular to a full-length bonded inclined anchor rod axial force monitoring device and an experimental method. The full-length bonded inclined anchor rod axial force monitoring device and the experimental method aim to solve the problem of difficult detection ofanchor force in tunnel construction at the present stage. The full-length bonded inclined anchor rod axial force monitoring device comprises an assembled anchor rod to be monitored, and dynamometers are installed on the assembled anchor rod to be monitored. A special-shaped protective sleeve sleeves the outer part of each dynamometer, and a canted tie plate fixing the assembled anchor rod to be monitored to surrounding rock of a tunnel is installed on the end part of the bottom of the assembled anchor rod to be monitored. The assembled anchor rod to be monitored includes at least three sections of threaded steel bars, and threads are formed at both ends of the threaded steel bars. The dynamometers are installed between every two threaded steel bars through thread fit. The special-shaped protective sleeves are hollow cylindrical sleeves, and at least two symmetrical externally-inclined horn-shaped block piece groups are arranged on each of the side surfaces of both ends of the special-shaped protective sleeves. The full-length bonded inclined anchor rod axial force monitoring device has the advantages that the anchor rod is uniformly forced, shear stress damage at the end of the anchor rod is avoided, abrasion damage due to extrusion of a conductor during installation is avoided, and segmented axial force testing of the full-length bonded anchor rod is ensured.