The invention relates to a plug for a switching device. The plug comprises two contact-use connection pieces, elastic pieces, a support and mounting plates, wherein the two contact-use connection pieces and the elastic pieces are used for forming a conducting loop, the support is used for mounting the two contact-use connection pieces, and the mounting plates are used for mounting the elastic pieces. The two contact-use connection pieces are arranged on the two sides of the support respectively, and the elastic pieces abut against the contact-use connection pieces and exert certain pressure on the contact-use connection pieces; the inner surfaces of the two sides of the two contact-use connection pieces form a first contact face in contact with a drawer seat busbar and second contact face in contact with a body busbar. When the plug is plugged in, the first contact face and the second contact face are in contact with the drawer seat busbar and the body busbar respectively, breakover of a circuit is achieved, the current is borne, the main function of a switch is achieved, when the current flows across the switching device, electric power is overcome through pressure of the elastic pieces on the contact-use connection pieces, and a power system can operate safely and effectively.