Depth measuring device

The utility model provides a depth measuring device which comprises a measuring tool, a sliding block, a measuring needle, a supporting plate and a supporting arm, the upper end of the supporting arm is fixedly connected with the supporting plate, the lower end of the supporting arm extends downwards along the vertical direction, the surface of the supporting plate is provided with a sliding groove, the measuring tool comprises a ruler frame and a measuring rod, the ruler frame is fixedly connected with the sliding block, the sliding block is sleeved in the sliding groove, and the measuring rod is connected with the sliding block. The upper end of the measuring needle is fixedly connected with the measuring rod, and the lower end of the measuring needle extends downwards in the vertical direction. According to the technical scheme of the utility model, the measuring tool is stably and reliably supported by the supporting arm, so that an operator is prevented from holding the measuring tool by hand, the measur