Tunnel face front rock mass deformation testing element and magnetic ring testing device

The utility model discloses a testing element and a magnetic ring testing device for deformation of a rock mass in front of a tunnel face. A rock mass deformation testing element in front of a tunnelface comprises a plurality of magnetic rings, a measuring pipe and a grouting pipe. The grouting pipe and the measuring pipe are arranged in parallel; the interior of the measuring pipe is hollow, andthe first end pipe orifice is closed; the grouting pipe is hollow, and pipe orifices at the two ends are open; and the magnetic ring is sleeved outside the measuring pipe and the grouting pipe. The magnetic ring testing device comprises a magnetic ring inductor and a magnetic ring measuring rod. The magnet ring measuring rod is connected with the magnet ring inductor through a wire, scales are marked on the magnet ring measuring rod, the magnet ring measuring rod can extend into the measuring tube of the testing element, and the magnet ring measuring rod triggers the magnet ring inductor to generate induction signals