The invention discloses an exploiting method for a sharp inclined coal seam. The exploiting method for the sharp inclined coal seam comprises the following steps that S001, the sharp inclined coal seam is sequentially partitioned into a plurality of horizontal section exploiting layers in the horizontal direction from top to bottom, and each horizontal section exploiting layer is partitioned into an exploiting bottom layer and a coal discharging top layer located on the upper portion of the exploiting bottom layer according to the thickness; and S002, the horizontal section exploiting layers are sequentially exploited from top to bottom, coal exploiting equipment is adopted for exploiting in the exploiting bottom layers, and the coal discharging top layers are pre-weakened always before the coal exploiting equipment is used in the exploiting process of the horizontal section coal exploiting layers, so that weakened areas are formed; and after the coal exploiting equipment advances into each weakened area in the corresponding coal discharging top layer, coal in the coal discharging top layer is discharged.