Underground while-drilling remote control telescopic short drill collar

The invention relates to an underground while-drilling remote control telescopic short drill collar in the field of an underground operation tool. The underground while-drilling remote control telescopic short drill collar comprises an outer drill collar, an inner drill collar, a center pipe, a spring, a control valve and a positioning pin, wherein the inner drill collar is arranged between the outer drill collar and the center pipe, the center pipe is fixedly arranged inside the outer drill collar, the positioning pin is arranged on the outer drill collar, the control valve is arranged between the center pipe and the outer drill collar, a control chute is processed in the control valve and is matched with the positioning pin, by-pass holes are processed in the control valve and the center pipe, the spring is arranged between the control valve and the center pipe, the inner drill collar and the outer drill collar are provided with glidingly matched splines, and the bottom end of the inner drill collar and the bottom end of the outer drill collar are provided with outer spline groups in inserting and connecting matching. The mechanical property of a drilling tool combination is changed through controlling the work state of the telescopic short drill collar, the borehole track regulation requirement caused by stratum or target stratum change is completed, the track control precision is improved, and the borehole quality is improved, so that the well drilling efficiency is improved, the well drilling cost is reduced, and the well drilling energy source loss and the non-drilling time consumption due to tripping are reduced.