Measuring rule

The utility model discloses a measuring ruler which mainly consists of main rods, sliding rods and a measuring rod; one ends of the two main rods are connected by a rotating shaft; the two sliding rods are respectively connected at the position of the rotating shaft at the ends of the two main rods; a slide bushing is respectively arranged at one ends of the two sliding rods; one ends of the two measuring rods are respectively fixed on the two main rods and are sheathed together with the slide bushings on the two sliding rods, one main rod is provided with a bent ruler, the other main rod is provided with a ruler sheath, and the bent ruler is sheathed in the ruler sheath. By the arrangement, when measuring is carried out by using the measuring ruler, the two measuring rods can be directly inserted to the interior of equipment or parts so as to directly measure smaller gaps and the outer and inner diameters of the parts.