A linear guiderail pair of an integral injection molding pin roller comprises a guiderail, a sliding block body and a rolling device, wherein a trapezoid-shaped groove is arranged in each of the two sides of the guiderail, a guiderail raceway surface is arranged on the trapezoid-shaped groove, an internal cavity is arranged at the bottom of the sliding block body, the rolling device is arranged in the internal cavity, the sliding block body rides across the guiderail through the rolling device, the rolling device comprises a waist-shaped circulating raceway, a pin roller is arranged in the circulating raceway, the circulating raceway comprises a raceway groove, a bead return hole, a reverse transition block and a reverse transition bridge, and the pin roller in the raceway groove slides along the guiderail raceways surface, so that a sliding block and the guiderail move relatively. The structure of the sliding block eliminates the matching error between a reverse groove and the raceway groove and the bead return hole, and the reverse flexibility and the operating accuracy of the rolling linear guiderail pair are guaranteed; and meanwhile, the reverse structure curve of the reverse transition block comprises two arc sections and a flat and straight section, so that the pin roller is in smooth transition, and the reverse impact is small.