Air pipe inner diameter measuring device

The utility model relates to a device for measuring the inner diameter of a trachea, which comprises a handle, the handle is carved with a scale, and the handle is also sleeved with a movable sleeve; an inner guide wire is arranged in the outer sheath tube in a sleeved mode, one end of the outer sheath tube is fixedly connected to the handle, the other end of the outer sheath tube is fixedly connected with one end of the inner guide wire, and the other end of the inner guide wire is fixedly connected to a movable sleeve; wherein a measuring part is arranged on the tube wall of one end, far away from the handle, of the outer sheath tube. The measuring part divides the outer sheath tube into a first connecting section and a second connecting section, the measuring part comprises two V-shaped tentacles which are symmetrically arranged, and the two ends of the tentacles are connected to the first connecting section and the second connecting section respectively. According to the utility model, the measuring part