Under-microscope fusion surgery reamer with guiding and depth measuring functions

The utility model relates to the technical field of medical instruments, in particular to a depth-measurable endoscopic fusion surgery reamer with guidance, which comprises a handle, a reamer bar fixedly connected with the handle and a reamer head arranged at the front end of the reamer bar. A first through hole is formed in the axial center position of the cutter bar, a second through hole is formed in the center position of the length direction of the cutter head, and the second through hole is communicated with the first through hole; a plurality of positioning holes are formed in the middle of the tool bit and penetrate through the upper face and the lower face of the tool bit. The first through hole and the second through hole form a hollow guide channel for a guide wire to pass through, so that the reamer can be quickly and accurately placed into an intervertebral space under the guide of the guide wire; due to the arrangement of the reamer positioning hole, the position of the reamer head can be displa