The invention discloses a method for repeated-mining a stopping-line coal pillar in an extra-thick coal seam residual mining area and filling an extra-thick coal seam with layered pasty fluid. The method for repeated-mining the stopping-line coal pillar in the extra-thick coal seam residual mining area and filling the extra-thick coal seam with the layered pasty fluid comprises the steps that 1, the thickness of an extra-thick coal seam is determined according to mine data, and the mining thickness of each separated layer is determined; 2, comprehensive detection is conducted on an original working face gob, and existing potential safety hazards are eliminated; 3, roadway tunneling is conducted on a layered coal seam of the upper portion of the stopping-line coal pillar of the extra-thick coal seam; 4, the end of an original mining roadway of the extra-thick coal seam is blocked off; and 5, mining with filling is conducted on each layered coal seam. According to the method for repeated-mining the stopping-line coal pillar in the extra-thick coal seam residual mining area and filling the extra-thick coal seam with the layered pasty fluid, the amount of pressed coal of the stopping-line coal pillar of the extra-thick coal seam is reduced, waste of coal resources is reduced, and the potential of the coal resources is fully released; and the economic benefits of coal enterprises are improved, the resource pressure of the coal enterprises is relieved, and the lives of a mine and a mine lot are prolonged.