Folding wall perpendicularity detection ruler

The utility model discloses a folding wall verticality detection ruler, which relates to the technical field of detection rulers and comprises a main rod, a grip is fixedly mounted at the top of the main rod, a first groove is formed in one side of the grip, a second groove is formed in the main rod, a level tube is fixedly mounted in the second groove, and a first positioning hole is formed in the level tube. The first rotating column is arranged on one side of the main rod, the main rod can be better held through the grip and the first groove, the main rod cannot be lost, the second groove is formed in the main rod, the level tube is fixedly installed in the second groove, detection can be better carried out, the first rotating column is arranged on one side of the main rod, and the first rotating column is arranged on the other side of the main rod. The two main rods can be connected through the limiting device, a seventh groove is formed in the end, away from the limiting device, of one side of each main