High-recovery-rate recovery method for protecting coal pillar in mine industrial site

The invention relates to a high-recovery-rate recovery method for protecting coal pillars in a mine industrial site. An isolation belt is formed by constructing isolation grouting drill holes, an inner unconsolidated formation of a protected area is isolated from an outer unconsolidated formation, when a coal seam on the periphery of a new protection coal pillar is mined, the outer unconsolidated formation is stretched to be separated from the isolation belt, and the unconsolidated formation in the rectangular protected area is not affected due to the isolation effect of the isolation belt; therefore, the arrangement quantity of the protection coal pillars can be greatly reduced. On the basis, the protection coal pillar is divided into an internal filling mining area and an equal-width long-wall caving method isosceles trapezoid ring, the filling mining area adopts an original fully-mechanized coal winning machine of a mine to carry out roadway type cemented filling coal mining, and the safety of a ground ind