The invention discloses a linear guide rail. The linear guide rail comprises a sliding base, a guide rail body, a rolling structure and a limiting structure. The rolling structure is composed of a pair of ball bearings and a pair of U-shaped snap springs. The limiting structure is composed of a pair of limiting pieces and a pair of blocking pieces. According to the linear guide rail of the structure, the linear guide rail has substantive characteristics and obvious improvement. The overall structural design is ingenious, and the linear guide rail serving as a precise workpiece has the utilization effect superiority in space. During horizontal sliding, the deviation of the sliding base in the gravity direction is extremely low, and excellent solutions are provided for the modern science and technology development combined with cross-cutting multi-technology application. In addition, compared with the manufacturing cost, the cost of the linear guide rail is lower than that of linear guide rails of other structures in developed countries.