Convex navel height measuring instrument

The utility model provides a convex navel height measuring instrument, which effectively solves the problem that the conventional measuring implement is difficult to control. The technical measures are as follows: the convex navel height measuring instrument is composed of a gauge outfit (1), a measuring rod (4), a fastened handle (5) and a gauge base (6); the gauge shell of the gauge outfit (1) is fixedly connected with the fastened handle (5) and the gauge base (6), the measuring rod (4) is connected with a gauge pointer (2) through a gear transmission mechanism (3) in the gauge outfit (1); the fastened handle (5) and the gauge base (6) are sleeved at the outside of the measuring rod (4); and a gap capable of enabling the fastened handle (5) and the gauge base (6) to move relatively exists between the measuring rod (4) and the fastened handle (5) and the gauge base (6). In measurement, firstly, the gauge pointer (2) of the convex navel height measuring instrument is set to zero point, and then, the measurin