Abstract: The construction challenges of installing casing pipes for water exploration and drainage boreholes in “three soft strata”, dealing with roof collapses and water seepage upon encountering water, borehole collapses and blockages, and borehole necking have long been difficult to resolve. Through theoretical calculations and engineering practice, an innovative construction technique for water exploration and drainage has been developed. Optimization of drilling parameters: the vertical height of most drainage water drilling holes on the roof of the 11701 working face is set at 200 m, with a final hole spacing not exceeding 60 m. This densification approach has targeted water-rich areas. Technological advancement has overcome the challenge of difficult consolidation after casing elongation, resulting in the development of a “graded grouting for pipe stabilization” method. This innovative approach ensures the secure installation of the entire casing at the designated position, facilitating rapid stabilization and installation of extra-long casing in soft rock regions. To address the technical challenges of collapse and blockage in water exploration drilling holes in the “three soft strata,” innovative solutions have been developed, including the three-stage grouting and the “full-hole flower tube wall protection” new technique. Engineering practice has demonstrated the effectiveness of this technology suite in overcoming the construction difficulties encountered in water exploration drilling holes in the “three soft strata.”