Horizontal steel coil height measuring device and measuring method thereof

The invention discloses a horizontal steel coil height measuring device and a measuring method thereof, each of a photoelectric transmitting tower and a photoelectric receiving tower which are arranged at two sides of a steel coil saddle comprises a detection tower body which is provided with a longitudinal sliding groove, a detection groove and a directional sliding wheel sliding hole, and the bottom of the detection tower body is connected with a lifting motor; an output shaft of each lifting motor is connected with a lifting motor worm, each lifting motor worm is connected with two photoelectric moving lead screws through a transmission structure, one photoelectric moving lead screw is located above the transmission structure, the other photoelectric moving lead screw is located below the transmission structure, and the two photoelectric moving lead screws are provided with photoelectric moving nuts respectively. The outer edge of each photoelectric moving nut extends to be connected with a directional sli