Magnetic depth detecter for winding drum of winding engine

The utility model relates to a magnetic depth detector for a winding drum of a winding engine. The utility model is used for repairing an oil well or a water well. The utility model is composed of a permanent magnet 1 which is fixed at one side of the winding drum of the winding engine, a magneto sensor 2 which is arranged in the magneto sensor protecting cover 3 which is arranged at the side or above the permanent magnet 1, a signal lead wire 4, and a microcomputer 5 which is connected with the signal lead wire 4. The utility model has the advantages of novel design, simple structure, convenient operation, reliable work, low cost, and long service life. Besides, the utility model can be used for accurately measuring the dropping depth of a steel cable in the process of repairing the oil well or the water well.