The utility model belongs to the technical field of a tool fixture and provides a fixture mechanism for machining a glass mold. The fixture mechanism for machining the glass mold comprises a base. Press feet are arranged on a press feet sliding groove which is arranged on the smooth surface of the base. A mold supporting block fixation seat and a mold supporting block sliding chamber are arranged on the base, wherein the mold supporting block fixation seat is matched with the mold supporting block sliding chamber. A mold supporting block fixation seat nut is arranged the mold supporting block fixation seat. A lifting screw rod of the mold supporting block fixation seat is connected on the mold supporting block fixation seat nut at one end and supported on the smooth surface of the base at the other end. A mold supporting block is fixed with one side of the mold supporting block fixation seat. One ends of the press feet stretch out of the surface of one side of the base. A first guide sliding groove and a second guide sliding groove are arranged on one side of the base. A bottle mold end face positioning mechanism is arranged on the other side of the base. The fixture mechanism for machining the glass mold has the advantages that a traditional manner of engraving flowers in a cavity of the glass mold by electric sparks is abolished, quality and efficiency of engraving flowers are guaranteed, operation is convenient and rapid, resources are saved due to good adaptability of clamping and the mold cavity is not interfered.