• A novel device for consolidating and sealing in-situ internal stress in deep rocks was developed, comprising three modules: material consolidation cultivation, in-situ stress environment simulation, and multi-source information capture.
• Three mechanical tests (internal stress preservation, release, and conventional) were conducted, revealing that consolidation-sealing significantly affects the mechanical properties of simulated rock material.
• Internal stress release leads to damage of material properties, indicating that the presence and influence of internal stress should not be overlooked in deep rock mechanics.
• The study provides a new research direction and scientific devices for expanding and deepening the field of deep in-situ rock mechanics.