The invention relates to a method for purifying phloretin from malus spectabilis leaves. According to the technical scheme, the method mainly comprises the steps of extraction, alcohol precipitation, extraction, crystallization, acid hydrolysis, extraction, purification and the like, accordingly the phloretin content of 98% or above is obtained, and the yield is 70% or above. The method is simple in process, low in cost and suitable for industrialized production.