Indoor building perpendicularity measuring device

The utility model discloses an indoor building verticality measuring device, which relates to the technical field of constructional engineering, and comprises a rectangular frame, a rope, a plumb bob, a first connecting block and a second connecting block, the rectangular frame is internally provided with a winding mechanism, the winding mechanism is used for winding the rope, and the second connecting block is used for connecting the rope with the plumb bob. The first connecting block and the second connecting block are respectively connected with the rectangular frame through a first connecting rod and a second connecting rod; the axis of the second connecting rod is perpendicular to the lower surface of the rectangular frame, and one end of the rope penetrates through the first through hole and the second through hole in sequence to be fixedly connected with a plumb bob. Under the combined action of the winding mechanism and the plumb bob, the rope sequentially penetrates through the first through hole and