Abstract: A plug structure for connecting sockets comprises at least one jack formed at a side of a first socket; and a plug rod disposed on a second socket corresponding to the at least one jack and configured to plug in the at least one jack. The plug rod is electrically contacted with a spring piece in the jack so as to electrify the second socket. A slidable baffle plate is disposed on an inner side of the at least one jack and is configured to cover the jack. A through hole corresponding to the jack is formed in the baffle plate. A slope configured to push the baffle plate is disposed at a position on the baffle plate corresponding to the jack, and is disposed at an edge of the through hole and fitted with the plug rod to push the baffle plate to be inserted into the through hole. The plug structure for connecting sockets according to the present disclosure provides an improvement for a security protection of combined interfaces of the sockets, thus ensuring a security of the combined sockets.