The invention provides a power supply plug, comprising a shell, and a plug contact piece and a conducting wire which are assembled in the shell. The power supply plug further comprises a conductive elastic sheet and a magnetic element which are assembled in the shell, wherein the conductive elastic sheet is connected with the conducting wire and is adjacent to the plug contact piece at intervals; and the magnetic element is adjacent to the conductive elastic sheet, so that the conductive elastic sheet and an electric contact piece are in contact and conducted with each other when the power supply plug works. The invention further provides a power supply socket matched with the power supply plug. The power supply socket comprises the shell, and a socket contact piece and a magnetic conducting sheet which are assembled in the shell. When the power supply socket and the power supply plug are used together, the socket contact piece is in contact with the plug contact piece of the power supply plug, the magnetic conducting sheet enables the conductive elastic sheet of the power supply plug to be electrically connected with the plug contact piece under the magnetic absorption of the magnetic element of the power supply plug. When the power supply plug is not inserted in the power supply socket, the plug contact piece in the power supply plug and the conductive elastic sheet are not in contact connection, thereby avoiding the leakage of electricity.