Method for constructing ecological barrier of coal mining subsidence area

The invention relates to a method for constructing an ecological barrier in a coal mining subsidence area. The method comprises the following steps of constructing a vertical contour line ecological barrier and constructing a parallel contour line ecological barrier. During constructing of the vertical contour line ecological barrier, check sluice hierarchical control is established. During constructing of the parallel contour line ecological barrier, intercepting ditch ridges, bank slopes, terrestrial plant areas and aquatic plant areas are built, and the terrestrial plant areas are arrangedbetween the intercepting ditch ridges to intercept the loss of N, P and organic matters in soil; the bank slopes are of gabion retaining wall structures, and gabion retaining walls are arranged to beof flexible structures and are used for reducing water and soil losses and adapting to differential settlement of a soil body; and the aquatic plant areas are arranged in lake bodies formed by the subsidence area and sequentia