Abstract: In view of the leakage problem caused by the wear and seal deterioration of the slide valve pair in coal mine hydraulic support control valves under complex working conditions, based on the theories of contact mechanics and fluid dynamics, the coupling mechanisms of clearance flow field and stress relaxation are revealed, and a multi-physical field intelligent detection system integrating pressure-flow characteristics and acoustic emission positioning is constructed to improve the real-time performance and accuracy of leakage identification. Internal leakage control strategies for laser cladding remanufacturing and dynamic dimension chain compensation are proposed, as well as external leakage governance methods for composite sealing structures and pre-tightenting force compensation. The engineering application shows that the leakage failure rate is reduced by 84.4%, the system cleanliness degree is improved by 3 levels, and the maintenance cost per ton of coal is reduced by 5.0 yuan. The economic analysis indicates that the annual savings are 625 000 yuan, the investment payback period is only 7.5 months, and the annualized rate of return reaches 161.5%. The research results provide a technical path and economic support for the transformation of hydraulic support operation and maintenance from passive maintenance to intelligent prevention and control.