Depth finder for measuring depth of proximal humerus bone hole

The utility model discloses a depth finder for measuring the depth of a proximal humerus bone hole, which comprises a device main body, one side of the device main body is fixedly connected with a needle body, one side of the needle body is fixedly connected with a needle body fusiform head end, and the outer wall of the needle body is movably sleeved with a sleeve top end. The outer wall of the top end of the sleeve is movably sleeved with a cylindrical connecting cap, and the outer wall of the device body is movably sleeved with a sleeve. By means of the designed sleeve top end, the barrel-shaped connecting cap, the sleeve and the needle body fusiform head end, the device body is installed in the sleeve for connection, when the device body is inserted into the sleeve, the outer wall of the needle body fusiform head end can penetrate out of one side of the sleeve, and when the device body is fixed into the sleeve, the device body is fixed into the sleeve through the barrel-shaped connecting cap and the needl