A rotary plug includes a base, a plurality of annular slot structures, a plurality of conductive components, a bridging component and a plurality of terminals. An accommodating space is formed on the base. The annular slot structures are respectively disposed on an inner wall of the accommodating space. Each conductive component is disposed inside the corresponding annular slot structure. A protrusion of the conductive component inserts into a hole formed on the annular slot structure. The bridging component is rotatably disposed inside the accommodating space. A first end of the terminal protrudes from a bottom of the bridging component. A second end of the terminal protrudes from a lateral surface of the bridging component and movably inserts into the annular slot structure to electrically contact the conductive component.