Device for polishing bottom of glass

The utility model discloses a device for polishing the bottom of a glass cup. Machine base, a circular hole is formed in the upper end face of the machine base. An air cylinder is fixedly connected into the machine base. The upper end of the air cylinder is fixedly connected with a push rod; the upper end of the push rod is fixedly connected with a connecting base; a groove I is formed in the upper end of the connecting base; a clamping block is fixedly connected to the inner wall of the first groove, a limiting piece is movably connected to the upper end of the connecting base, a second groove is formed in the upper end of the limiting piece, a clamping groove is formed in the lower end of the limiting piece, a glass cup is movably connected into the second groove, and a supporting pieceis fixedly connected to the upper end of the machine base. According to the device for polishing the bottom of the glass cup, the connecting base is supported and moved through the five push rods, itis guaranteed that the con