The invention discloses a raw coal bunker for conducting pre-drying on low-rank coal through waste heat of a power station. The raw coal bunker comprises a raw coal bunker body, a plurality of heat exchange mechanisms and a smoke air drying mechanism used for leading in hot smoke air are arranged on the raw coal bunker body horizontally, and the multiple heat exchange mechanisms are sequentially arranged from top to bottom; each heat exchange mechanism comprises a plurality of layers of heat exchange pipes, the smoke air drying mechanism comprises a plurality of layers of horizontally-distributed air distribution pipes, the heat exchange pipes are arranged in the mode of being vertical to the air distribution pipes, and the air distribution pipes are dispersed between the multiple layers of heat exchange pipes. The raw coal bunker has the advantages that the unique smoke air drying mechanism has the effects of fluidifying and loosening coal seams and achieving blocking prevention to a certain degree, the air supply pressure is reduced, and raw coal blanking is more smooth; as the aim of drying large-granularity high-moisture-content coal is achieved from a source, the difficulty of follow-up breaking, powder manufacturing and the like of the raw coal is reduced, and the total energy consumption of a power plant is reduced wholly; in addition, as the drying temperature is low, and the coal granularity is large, potential safety hazards like braize explosion easily occurring in the braize drying process are avoided.