Drill rod with height convenient to adjust for coal mining

The invention relates to the field of drill rods, in particular to a drill rod convenient for height adjustment for coal mining. According to the drill rod convenient to adjust the height for coal mining, the drilling depth can be increased, and the stability is good. A drill rod convenient to adjust in height and used for coal mining comprises a supporting frame, a driving motor, a sliding frame, a first gear set, an outer drill rod, a linear sliding rail and the like. Linear sliding rails are connected to the front portion and the rear portion of the supporting frame, a sliding frame is connected between the two linear sliding rails through sliding blocks, a driving motor is connected to the left portion of the sliding frame, an outer drill rod is rotationally connected to the middle of the sliding frame, and a first gear set is fixedly connected between the upper portion of the outer drill rod and an output shaft of the motor. The outer drill rod is used for drilling in a soft outburst coal seam of an unde