Provided is a method for cultivating ganoderma and collecting ganoderma spore powder. The method comprises the steps that pure broad-leaved tree basswood serves as a culture medium, a ganoderma variety is selected, when ganoderma sporophores enter the mature period and begin to generate spore powder, a paper pad is inserted into and padded at the root of each ganoderma sporophore, each paper pad is horizontally clamped and inserted into the root of the ganoderma sporophore through a sheared seam sheared in advance, and then tea filter paper or air-permeable non-woven fabric or gauze tubes are arranged; at the ganoderma cover powder appearing period, ganoderma stalks are wrapped by an absorber impregnated with a 100-500 mg/1000 mL of somatomedin gibberellin solution, wherein the absorber is cotton or sponge or fiber or fabric, the outer layer of the absorber is provided with rectangular plastic film which wraps the absorber into a cylinder, and absorption of the stalks is guaranteed; a ganoderma cylinder is wrapped with the wrapped cylinder of the absorber through upper and lower omega-shaped plastic or steel wire clips at the initial period or imminent critical period.