The utility model relates to a blowout wrecking device for mechanically installing a plug valve. The technical scheme is that the blowout wrecking device is movably connected on one side of a well mouth or a well repairing blowout preventer flange and mainly composed of a support rod sleeve, a fastening handle, a support spring, a movable support rod, a cross hand wheel, a cross guiding sleeve, a rotating handle, a rotating short section, a central support and the plug valve. The upper end of the support rod sleeve is connected with the movable support rod through the support spring and the fastening handle, the cross guiding sleeve is fixed at the top of the movable support rod, the cross hand wheel is arranged at one end of the cross guiding sleeve, the central support is connected at the other end of the cross guiding sleeve, the rotating short section and the rotating handle are arranged at the top of the central support, and the plug valve is movably connected at the bottom of the central support. The blowout wrecking device has the advantages that during workover treatment of an oil field, when the pressure in a well rises suddenly and blowout occurs, the plug valve can be installed fast, forcefully and mechanically, liquid gas in the well can be prevented from ejecting outwards through an oil pipe, and the problem that the plug valve cannot be installed easily without any supporting reference substance during traditional manual removing is solved.