The invention relates to an extract preparing method and application of an extract in the aspect of preparing medicines/health care products for treating/controlling high-uric-acid related diseases, in particular to a poria-cocos-extract preparing method and application of a poria cocos extract in the aspect of preparing medicines/health care products for treating/controlling high-uric-acid related diseases. The poria-cocos-extract preparing method and application have the advantages that the preparing technology of the poria cocos extract is simple, and the cost is low; ethyl alcohol or wateror a mixed solvent of ethyl alcohol and water serves as a solvent for extracting poria cocos, the pollution or residual problem of an organic solvent is solved, and safe and environment-friendly effects are achieved; the poria cocos extract has a remarkable uric-acid reducing effect, is small in side effect, can be used for preparing a medicine for reliving a gout disease, and provides a new direction for improving a phenomenon of a large side effect of a present gout disease medicine.