Ganoderma lucidum spore polysaccharide and preparation method and application thereof

The invention relates to a ganoderma lucidum spore polysaccharide and a preparation method and application thereof. The ganoderma lucidum spore polysaccharide is water soluble glucan, the molecular weight is within the range of 700-10000Da, and the part of which the molecular weight is 2000-4900Da is 60-85%. The method comprises the following steps: carrying out thermal treatment on ganoderma lucidum spore powder by using an inorganic acid or organic acid solution; removing the solvent in a vacuum distillation manner, and then soaking the ganoderma lucidum spore powder by water; filtering the soaking liquid and adding an organic solvent to participate; dissolving sediments by water; centrifuging and taking supernate to concentrate and dry, so as to obtain the ganoderma lucidum spore polysaccharide. The ganoderma lucidum spore polysaccharide can be used for preparing a drug or a health-care product with the functions of resisting tumors and enhancing the immunity.