The utility model belongs to the technical field of collapse prevention bunkers for raw coal bunkers and surge bunkers, and particularly relates to a collapse prevention bunker drainage device. The collapse prevention bunker drainage device solves the problem that an existing coal bunker collapse prevention measure treats the symptom instead of the underlying problem, and bunker collapse can not be prevented from the source. The collapse prevention bunker drainage device comprises a plurality of drainage pipes which are distributed along the inner wall of a coal bunker at equal intervals and are attached to the inner wall of the coal bunker, the bottoms of the drainage pipes are connected with a main drainage pipe outside the coal bunker, the drainage pipes are connected with a plurality of drainage mouths, the drainage mouths in the upper portion are sparse, and the drainage mouths in the lower portion are dense. The collapse prevention bunker drainage device is compact in structure and convenient to construct, more than 95% of water in materials inside the coal bunker can be drained out of the bunker, the drainage effect is good, and the bunker collapse accident is completely eradicated from the source; the drained sewage is separated from materials containing water, the water can be recycled after subsiding, the water content of raw coal is reduced, the materials can effectively relieve the burdens of filter pressing and dehydration equipment after entering a washing system, and the water percent of pass of products is improved.