The invention discloses an accessor and an access method. The accessor uses the access method. The access method comprises the steps that a connecting request sent by terminal equipment and comprising a switch number connected with the terminal equipment is received, and when the numbered switch stores a safety setting command and is subjected to hardware address binding with the terminal equipment, the numbered switch can be accessed. With the adoption of the accessor and the access method, a standard of an internal user on backbone network switch equipment access in a power network dispatching automation system is improved, and the safety access to backbone network switch equipment is achieved.