Push broach for cutting glass

The utility model discloses a push broach for cutting glass, which comprises a glass backup plate, a cutter bar is fixedly mounted on one side of the top of the glass backup plate, a cutter head seat is movably connected outside the cutter bar, a movable cover is movably connected to the top of the cutter head seat, a prompting mechanism is movably connected to one side of the cutter head seat, and a limiting mechanism is movably connected to one side of the glass backup plate. The prompting mechanism comprises a prompting box, and a first telescopic rod is movably installed at the bottom of an inner cavity of the prompting box. According to the scheme, when the quantity of lubricating oil in the tool bit seat changes, the floating plate can be driven to ascend or descend, so that the first telescopic rod and the support are driven to ascend or descend, and when the support descends and makes contact with the top of the prompt box, the quantity of the lubricating oil in the tool bit seat is small; a worker ca