Abstract: A power plug adapter includes a housing assembly, four plug assemblies movably arranged on the housing assembly, two rotating columns vertically arranged in the housing assembly and only rotating around an axis, and a movable pin arranged between the two rotating columns in an abutting mode. The plug assemblies are arranged in correspondence with one or more plastic bodies, one or more plug pins fixed on the plastic bodies, and one or more sliding buttons connected to the end of each of the plastic bodies. One or more sliding grooves for the sliding buttons to slide are provided on a shell of the housing assembly. In this construction, interlocking among the four plug assemblies can be achieved. The requirement of design, manufacture and assembly precision for the plug assembly and rotating column of the present invention are relatively decreased, and the possibility of a stuck fault is reduced.