Large-scale bolt-net supporting device for heading machine

The utility model relates to a large-scale bolt-net supporting device for a heading machine. The large-scale bolt-net supporting device comprises an underframe fixed on a cutting arm of the heading machine, an extension platform horizontally arranged in the underframe in a sliding manner, an oil cylinder I horizontally fixed on the underframe, two oil cylinders II of which the tail ends are hinged to the front end of the underframe, two oil cylinders III of which the tail ends are hinged to the rear end of the underframe, and a capping beam frame which is hinged to the top ends of piston rods of the two oil cylinders II and the top ends of piston rods of the two oil cylinders III respectively, wherein head ends of a piston rod of the oil cylinder I are connected to the extension platform; a piston rod of an oil cylinder IV pushes a thrust bracket to drive the oil cylinders II to rotate to a required angle, and at the same time, the two oil cylinders III rotate along with the oil cylinders II. The two oil cylinders II and the two oil cylinders III push a steel band bolt net and the capping beam frame to required positions of a tunnel. The oil cylinder I pushes the extension platform to extend outside, personnel can stand on the extension platform to perform bolt-net supporting operation. The bolting area is enlarged, the working safety of the personnel is improved, the working height is increased, and cutting heads are effectively prevented from moving by mistake to hurt the personnel and bring interference to the personnel.