Measuring scale for engineering supervision

The utility model discloses a measuring ruler for engineering supervision, which belongs to the technical field of measuring rulers and comprises a first straight ruler, a second straight ruler is slidably connected to the bottom of the first straight ruler, and a second insertion plate is mounted at the upper end of the second straight ruler and penetrates through the first straight ruler. By pressing a pressing block, a second inserting plate, a second sliding plate and a sliding column move downwards and compress a spring, the second sliding plate is separated from anti-skid lines on the top of the inner side of a sliding groove, and then the pressing block is pushed to drive the second sliding plate to slide forwards at the bottom of the first ruler; when the second ruler slides to the required length, the hand loosens the pressed pressing block, the second inserting plate, the pressing block and the second sliding plate can move upwards through the resilience force of the spring, and then the top of the