Detection device for tunnel formation capable of preventing collapse and having stable supporting structure

The invention relates to a detection device for a tunnel stratum capable of preventing the collapse and having a stable supporting structure, and comprises a protective layer and movable sliding blocks. The outer wall of the outer part of the bottom of the protective layer is provided with a damping spring, and a mounting plate is mounted at the lower end of the outer wall of the outer part of thedamping spring. Fixing blocks are connected to the left end and the right end of the inner wall of the mounting plate. The middle of the inner wall of the inner part of the mounting plate is providedwith a stretching plate. Sliding grooves are arranged in the upper end and the lower end of the inner wall of the rear end of the stretching plate. And the outer wall of the outer part of the movablesliding blocks are located on the inner wall of the inner part of the sliding grooves. The detection device has the following beneficial effects that: the stretching plate can move back and forth through the interaction of the