The invention discloses a 3X zoom machine vision lens. The 3X zoom machine vision lens comprises a lens combination structure; the lens combination structure includes a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, a diaphragm, a seventh lens, an eighth lens, a ninth lens, a tenth lens, an eleventh lens, a twelfth lens and a thirteenth lens; the axes of the first lens, the second lens, the third lens, the fourth lens, the fifth lens, the sixth lens, the diaphragm, the seventh lens, the eighth lens, the ninth lens, the tenth lens, the eleventh lens, the twelfth lens and the thirteenth lens are located on the same horizontal line; the first lens, the second lens and the third lens constitute a first lens group; the fourth lens, the fifth lens and the sixth lens constitute a second lens group; the seventh lens, the eighth lens, the ninth lens and the tenth lens constitute a third lens group; and the eleventh lens, the twelfth lens and the thirteenth lens constitute a fourth group. According to the 3X zoom machine vision lens of the invention, the first lens group, the second lens group, the third lens group and the fourth group cooperate with one another, so that the pixel value of the 3X zoom machine vision lens can achieve 5 million pixels when a working distance is 90mm, and the size of a corresponding chip is 2 / 3, and therefore, the requirements of high-end products can be satisfied; and the light passing aperture of the 3X zoom machine vision lens can be flexibly adjusted.