The invention relates to the technical field of white tea processing, in particular to a preparation method of white tea rich in mineral substance. The preparation method comprises the following stepsof withering, primary drying, rolling, micro fermentation, secondary drying, spreading for cooling and warehousing. The prepared white tea has good taste, contains rich aminobutyric acid and variousmineral substances and has the health-care functions of refreshing and arousing the brain, promoting nutrient absorption of human and improving human immunity.