Mechanical device for measuring drilling depth in real time and use method

The invention provides a mechanical device for measuring the drilling depth in real time and a using method. The mechanical device comprises a derrick, a hollow track shaft and a hollow track half shaft are fixedly arranged on the two sides of the interior of the derrick, a rotating hollow track half shaft is arranged on one side of the hollow track shaft, and the rotating hollow track half shaft abuts against the hollow track half shaft to form a whole shaft; an upper synchronous wheel is arranged at the top of one side of the hollow track shaft, a lower synchronous wheel is arranged at the bottom of one side of the hollow track shaft, the lower synchronous wheel and the upper synchronous wheel are connected through a synchronous belt, a fixed seat is fixedly arranged on the synchronous belt, a movable connecting device is arranged on one side of the fixed seat, and the movable connecting device abuts against the hollow track shaft and the hollow track half shaft to slide; a counting device is arranged at th