This utility model proposes a dial indicator testing device with adjustable support position, comprising: a testing instrument, a threaded column, and an adjusting mechanism. The threaded column is mounted on the testing instrument, and the adjusting mechanism is mounted on the outer wall of the threaded column. The adjusting mechanism includes a first fixing ring, a first nut, a second fixing ring, a second nut, and a telescopic component. The first fixing ring is sleeved on the outside of the threaded column, and the first nut is threadedly connected to the outer wall of the threaded column. The second fixing ring is sleeved on the outside of the threaded column, and the second nut is threadedly connected to the outer wall of the threaded column. The telescopic component is mounted on the outer wall of the second fixing ring. This utility model's adjustable dial indicator testing device, through the coordinated structure of the testing instrument, threaded column, and adjusting mechanism, facilitates dial indicator testing and allows for adjustment of the dial indicator's position according to actual usage needs, thus improving the device's practicality.