The utility model relates to a top of roadway board subsides and warp monitoring devices belongs to secret mine safety monitoring field. The suitable position in tunnel cross section top (being the middle part usually), the installation is originally subsided and is warp monitoring devices. Be fixed with the pneumatic cylinder promptly on transverse supporting plate, the piston rod of pneumatic cylinder is the threaded hole of tip, and the regulation head of screw is mated in the area of packing into in the screw hole, and the top processing of adjusting the head has the first mesopore of regulation, is equipped with the exerted ball that touches of part in the hole, and the hyaline tube that the pipe diameter is lighter than the pneumatic cylinder internal diameter is inserted to the pneumatic cylinder lower part, is equipped with sealed sliding fit's the vernier body in the hyaline tube. The utility model discloses simple structure, low cost, convenient to use can accomplish the roof safety monitoring work in secret mine tunnel, easily uses widely.