Portable measuring scale

The utility model provides a portable measuring scale, and relates to the technical field of measuring scales. The portable measuring scale comprises a main measuring scale, a telescopic mechanism with a telescopic function and a positioning mechanism, wherein the telescopic mechanism comprises a first groove. According to the portable measuring scale, a first spring is compressed by simultaneously pressing a rubber button at one end, far away from a telescopic mechanism, of a main measuring scale, and after one end of a bolt rod is attached to the inner side surface of a first groove, a positioning mechanism is pulled to drive an extended measuring scale to slide, so that the bolt rod slides along the direction of the first groove; then positioning buttons on the two sides of the positioning measuring ruler are pressed, so that the positioning measuring ruler slides on the inner wall of the extending measuring ruler, the measuring range of the main measuring ruler is further conveniently extended, and the si