Tunnel top supporting and reinforcing device

The utility model relates to the technical field of building construction, in particular to a tunnel top supporting and reinforcing device which comprises a supporting frame, three reinforcing frames are installed on the top of the supporting frame, fixing screw rods are connected to the three reinforcing frames in a threaded mode, a reinforcing plate is vertically installed on the bottom end face of one reinforcing frame, and a supporting plate is installed on the bottom end face of the other reinforcing frame. A supporting plate is horizontally installed between the other two fixing screw rods, the reinforcing plate is connected to the top of the supporting plate in an inserted mode, and two tripods are installed on the top end face of the supporting plate. Under the matching action of the tripods and the reinforcing plates, the supporting plates are moved from bottom to top to enable the bottoms of the reinforcing plates to be inserted into the supporting plates, after the supporting plates reach the desig