A rotational split adaptor for engaging with gold-plated contacts of a communication socket is introduced to comprise a common plug, a socket assembly and a rotational joint. The common plug further includes a plug end for engaging with the communication socket and an opposing first oblique surface. The socket assembly further includes a splitter and an opposing second oblique surface. The splitter has a plurality of parallel sockets electrically coupling with the communication socket, and the second oblique surface is used to pair with the first oblique surface. The rotational joint is constructed to pair the first oblique surface and the second oblique surface so as to provide angular sliding in between and thus to alter angling between the socket assemble and the common plug.