Glass tube annealing and holding furnace

The utility model relates to the technical field of annealing and holding furnaces, and discloses a glass tube annealing and holding furnace which comprises a holding furnace body, a conveying belt is arranged in the holding furnace body, a supporting seat is installed outside the conveying belt, a first clamping plate is installed at the top of the supporting seat, and a second rotating rod is installed in the supporting seat. A connecting rod is installed outside the third rotating rod, a second clamping plate is installed outside the connecting rod, the first clamping plate is matched with the second clamping plate, one end of the third rotating rod penetrates through the connecting rod, and by arranging the first clamping plate, the second clamping plate, the connecting rod, the third rotating rod, a rope, a sliding rod, a handle and a spring, the handle is pressed downwards, so that the clamping plate is fixed; and after the glass tube is put in, the handle is loosened to drive the second clamping plate