The invention discloses a gentle dip super-high seam rock cross-cut coal uncovering method, and is particularly suitable for protruded risk coal seam with small dip angle and large thickness of underground coal mine. When the rock cross cut is tunneled to be the vertical distance of 12 m relative to the coal seam, an inclined rock cross cut is dug on the right side of the rock cross cut; when the inclined rock cross cut is tunneled to be the vertical distance of 7 m relative to the coal seam, a coal bottom road is dug head-on on the inclined rock cross cut; the coal bottom road is parallel to the rock cross cut and tipsily dug along the coal seam. A plurality of drill sites are uniformly arranged in the coal bottom road which is completed; holes are drilled from the drill sites to the coal seam construction hydraulic cutting slot to pre-extract the coal seam gas; when the gas is extracted to reach the standard, the rock cross cut is recovered to tunnel in the original direction; the coal seam is penetrated to enter 2 m of roof, so that the coal uncovering work is completed. By construction of the coal bottom road, the gentle dip long drill holes which restrain the coal uncovering speed are transformed to the coal bottom layer-crossing drill holes, so that the bottleneck problem that the gentle dip super high seam is slow to uncover is solved, safe and quick coal uncovering is realized, and the method can be widely applied.