An apparatus for positioning an image measuring platform, the apparatus includes a horizontal base (11); a measuring platform (21) movable on the horizontal base; a support arm (12) extending in the Z-axis direction secured to the horizontal base; two parallel sliders (435) extending in the Z-axis direction fixed on the upper ends of the support arm; a first bar (411) for controlling the measuring platform to move in X-axis direction; a second bar (421) for controlling the measuring platform to move in Y-axis direction; a first cantilever (314) and a second cantilever (315) vertically attached on the two parallel sliders; a charge coupled device lens (31) fixed on the first cantilever and the second cantilever through a lens clamp (312) and a locking cap (313); a first screw handle (414) engaged with the holes of both sides of a first bracket (413) secured on the horizontal base, a first male screw thread (415) formed outside the first screw handle, and a first female screw thread (416) corresponding to the first male screw thread formed outside the first bar; and a second screw handle (424) engaged with the holes of both sides of a second bracket secured (423) on the horizontal base, a second male screw thread (425) formed outside the second screw handle, and a second female screw thread (426) corresponding to the second male screw thread formed outside the second bar.