This eco-friendly phase-change gel drilling hole sealing material is formulated from a blend of environmentally friendly, water-soluble polymers. It is primarily used for sealing drilling holes in underground coal mine gas extraction operations. The material meets performance requirements throughout the entire sealing process under various operating conditions, providing reliable material support for efficient gas extraction and intelligent real-time sealing during drilling. This material offers five key advantages. First, it utilizes an eco-friendly formulation, offering comprehensive benefits such as excellent sealing performance, low application volume, environmental friendliness and biodegradability, controllable phase transition, and low cost. Second, it is suitable for the entire borehole sealing process, meeting critical performance requirements such as low-resistance grouting, low-viscosity permeation, high-viscosity bonding, dynamic sealing, and green biodegradation. Third, it significantly enhances gas extraction efficiency, increasing the average gas concentration extracted per well by 1.2 to 1.5 times or more, and maintaining it stably above 30% over the long term, thereby effectively ensuring high-quality gas extraction from the borehole; Fourth, after the material degrades, the extraction equipment inside the borehole can be recovered, fundamentally reducing the sealing cost per borehole. Furthermore, the material usage per borehole is only 3%–5% of that of cement-based materials, significantly reducing the labor intensity of on-site construction; Fifth, the material offers stable and reliable performance, providing a solid material foundation for the engineering application of intelligent real-time sealing technology.