Guide rail

The utility model discloses a guide rail, which comprises a fixed guide rail and a moving guide rail slidably sleeved on the fixed guide rail. At least one elastic pre-tightening component fixed to the moving guide rail and at least one rolling component fixed to the moving guide rail are further mounted between the fixed guide rail and the moving guide rail, the elastic pre-tightening component comprises an elastic steel plate assembly and rolling assemblies, the elastic steel plate assembly is disposed along the fixed guide rail and a sliding direction, the rolling assemblies capable of rolling along the length direction of the fixed guide rail are mounted at two ends of the elastic steel plate assembly, and the rolling component comprises a plurality of rolling units capable of rolling along the length direction of the fixed guide rail and arranged along the fixed guide rail and the sliding direction. The elastic pre-tightening device is additionally mounted between the fixed guide rail and the moving guid