Telescopic supporting sliding measuring arm

The utility model relates to the technical field of engineering, in particular to a telescopic supporting sliding measuring arm, which comprises a sliding connecting arm and a fixed measuring arm, a guide rail fixed connecting plate is arranged at one end of the inner side of the sliding connecting arm, a through groove penetrating up and down is arranged at the end, close to the outer side, of the fixed measuring arm, and the guide rail fixed connecting plate is arranged in the through groove. A wheel track measuring wheel and a concave fixed wheel are arranged in the through groove, the fixed measuring arm used for being connected with the concave fixed wheel is of an openable structure, and the sliding connecting arm and the fixed measuring arm are connected through an arm length telescopic adjuster. Compared with the prior art, the utility model has the advantages that the sliding connecting arm and the fixed measuring arm can do relative motion to complete stretching and retracting, and can meet the requ