A multi-specification plug adapter, the multi-specification plug adapter comprises a first outer casing and a second outer casing assembled with each other. The second outer casing is provided with one or more than one socket hole; one or more than one slideable plug is located in the first outer casing. The plug is provided with a push button. The push button is located outside the first outer casing. The first plug pins or the second plug pins of the plug can be extended out of the first outer casing by pushing the push button. One set of or more than one set of corresponding shaft and shaft hole is located between the second outer casing and the first outer casing, the first outer casing can rotate against the second outer casing on the shaft.