The invention belongs to the field of processing agricultural products, in particular to a method for processing golden mushroom root powder. In the method, fresh golden mushroom roots serving as a raw material undergo boiling, dehydration, drying, grinding and sterilization to prepare the golden mushroom root powder, wherein in the drying step, the two-step drying method is adopted, so that the golden mushroom roots can be fully dried without damaging nutritive matters. The method has the advantages that: the golden mushroom roots which are discarded in the processing of golden mushrooms areused as a raw material, the waste golden mushroom roots are recycled, the source is wide, and the cost is low; and by processing the golden mushroom roots into the golden mushroom root powder, the wastes are changed into the valuables, and the problem that the discarded golden mushroom roots pollute the environment is solved.