A universal adapter structure comprises a housing, a socket unit, a first plug unit and a second plug unit. The first and the second plug units have a rocking base, two plug terminals and a driving member, respectively. The rocking base is pivotally disposed on the housing, the two plug terminals are fixed on the rocking base, and the driving member is movably disposed on the housing. By pressing the driving member, the rocking base can be pivoted, thereby driving an outer end of the plug terminal to pivot toward a direction away from the housing.