Adjustable precision guide rail for numerically-controlled machine tool

The utility model discloses an adjustable precision guide rail for a numerical control machine tool. The device comprises fixed guide rails, fixed plates, screw rods and movable guide rails, a limiting groove is formed in the upper end of the fixed guide rail; the lower end of the movable guide rail is connected with a limiting block; a pressing plate is further arranged in the limiting groove; anadjusting mechanism is mounted on the fixed plate; the adjusting structure comprises an adjusting rod, a concave sleeve, a movable ring, a fixed shaft and a movable plate; the movable ring is connected to the annular side face of the fixed shaft in a sleeving mode, the concave sleeve is arranged at the outer end of the movable ring, an adjusting rod is welded to the outer end of the concave sleeve, a transverse plate is connected to the upper end of the movable plate, scales are arranged on the outer side of the upper surface of the fixed plate, and the movable plate is fixed to the fixed plate through a locking bolt