The utility model relates to a positioning mechanism for a
glass engraving and milling
machine, which belongs to the technical field of
glass engraving and milling machines and comprises a mounting bottom plate, a mounting bracket is fixedly mounted at the top of the mounting bottom plate, an
engraving and milling
machine is fixedly mounted on the mounting bracket, and an
engraving and
milling cutter is rotatably mounted on a movable part of the
engraving and milling
machine. According to the positioning mechanism for the
glass engraving and milling machine, a mounting side plate is arranged on one side of a movable part of the engraving and milling machine, an electric lifting rod is arranged at the top of the mounting side plate, a positioning transverse plate is driven by the electric lifting rod to move downwards to the position below an engraving and
milling cutter, the electric lifting rod is rotated, and an
infrared ray device is rotated to the position aligned with the engraving and
milling cutter; and rays emitted by the
infrared ray device are in contact with the glass for positioning, so that the problems that a common glass engraving and milling machine for blue glass
processing is relatively complicated in positioning mode, and the edge of the blue glass is easy to damage when a cutter bar is in contact with the edge of the blue glass are solved.