The invention relates to an integrally injection-molded pin roller linear guide rail pair. The integrally injection-molded pin roller linear guide rail pair comprises a guide rail, a slide block body and rolling devices, wherein two sides of the guide rail are respectively provided with a trapezoid groove, the trapezoid grooves are provided with guide-rail rollaway surfaces, the bottom of the slide block body is provided with an inner cavity, the rolling devices are arranged in the inner cavity, the slide block body bestrides the guide rail through the rolling devices, each rolling device comprises a kidney-shaped circulating rollaway, pin rollers are arranged in the circulating rollaways, each circulating rollaway comprises a rollaway groove, a ball return hole, a reverse transitional block and a reverse transitional bridge, and the pin rollers in the rollaway grooves slide along the guide rail rollaway surfaces, so that the slide block can move relative to the guide rail. By adopting the slide block structure, the matching error among the reverse grooves, the rollaway grooves and the ball return holes can be eliminated, and the reverse flexibility and running precision of the rolling linear guide rail pair can be guaranteed; meanwhile, the reverse structural curve of the reverse transitional blocks consists of two arc sections and a straight section, so that the pin rollers can transit gently, and the reverse impact is small.