The utility model relates to the coal mine top board separation layer monitoring system fitting field, and concretely relates to a top board bed separation monitoring probe, which comprises a tensioning part, the tensioning part comprises a left roller at left side, a right roller at right side, a left reversing wheel arranged at the lower part of the left roller, a right reversing wheel arranged at the lower part of the right roller, a left wire rope, a right wire rope, and a support shaft laterally arranged among the left roller, the right roller, the left reversing wheel and the right reversing wheel, and a tensioning spring sleeved on the outside of the support shaft, the left wire rope passes around the left roller for one circle by a clockwise direction, and passes through the right end of the tensioning spring and comes around the right reversing wheel; the right wire rope passes around the right roller for one circle by an anticlockwise direction and is intersected with the left wire rope, and passes through the left end of the tensioning spring and comes around the left reversing wheel. The top board separation layer monitoring probe increase the frictional force between the wire rope and the roller, the sliding rate between the wire rope and the roller is reduced, and the monitoring accuracy is increased.