The invention provides a telescopic fiber preimpregnated silk guide comb suitable for pressure rollers having different diameters. The telescopic fiber preimpregnated silk guide comb comprises three layers of guide combs which can be adjusted in length, are connected in sequence and comprise first-stage guide combs, second-stage guide combs and three-stage guide combs, wherein the first-stage guide combs are arranged on a channel plate; and the tail ends of the three-stage guide combs are matched with the circular arc surface of the pressure roller, and are used for guiding fiber preimpregnated silks to transit the circular arc surface, and then conveying the fiber preimpregnated silks to the bottom of the pressure roller. The telescopic fiber preimpregnated silk guide comb can be freely adjusted in length within limits by arranging the three layers of guide combs which can be adjusted in length and are connected in sequence, can be matched with the pressure rollers having different diameters, and does not need to be replaced in a complicated process. The lengths of the three layers of guide combs can be rapidly and finely adjusted according to different mold work conditions so asto adapt to the laying of multiple mold curved surfaces, thus avoiding the trouble of replacing the guide combs of different lengths, and the problem that as the length of the guide comb is fixed andcannot be flexibly adjusted, the quality of laying of the fiber preimpregnated silks is affected.