The invention discloses a method for synthesizing 4-terpineol by catalyzing 1,4-cineole through a supported acid catalyst. The method comprises the following steps: preparing a catalyst, preparing 4-terpineol and the like. According to the method for synthesizing 4-terpineol by catalyzing 1,4-cineole through the supported acid catalyst disclosed by the invention, the chromatogram content can be 5% or lower after the 1,4-cineole in the raw oil is completely reacted, while the selectivity of the 4-terpineol reaches 80% or higher. Meanwhile, in addition to the 4-terpineol produced in the reaction, alpha-terpinene, gamma-terpinene and the like with high additional value can be produced, and the used mordenite supported acid catalyst can be recycled. The method disclosed by the invention has the advantages of small catalyst dosage, high selectivity, short reaction time, simple and convenient process, simplicity in operation and the like.